ANN: BList v 0.9.3, a list-like type with better asymptotic performance
We're pleased to announce the first public release of BList (v 0.9.3), a list-like type with better asymptotic performance. The BList extension module is available via PyPi: http://www.python.org/pypi/blist The BList is a type that looks, acts, and quacks like a Python list(), but has better performance for many (but not all) use cases. Below are some of the unique features of the BList: - just as fast as a Python list() when the list is small - insertion or removal from the list takes O(log n) time - getslice runs in O(log n) time and uses O(log n) memory, regardless of slice size - making a shallow copy runs in O(1) time and uses O(1) memory - setslice runs in O(log n + log k) time if the inserted slice is a BList of length k - multipling a BList by k takes O(log k) time and O(log k) memory Example: from blist import * x = blist([0]) x *= 2**29 x.append(5) y = x[4:-234234] del x[3:1024] None of the above operations have a noticeable delay, even though the lists have over 500 million elements due to line 3. The BList has two key features that allow it to pull this off this performance: 1. Internally, a B+Tree is a wide, squat tree. Each node has a maximum of 128 children. If the entire list contains 128 or fewer objects, then there is only one node, which simply contains an array of the objects. In other words, for short lists, a BList works just like Python's array-based list() type. Thus, it has the same good performance on small lists. 2. The BList type features transparent copy-on-write. If a non-root node needs to be copied (as part of a getslice, copy, setslice, etc.), the node is shared between multiple parents instead of being copied. If it needs to be modified later, it will be copied at that time. This is completely behind-the-scenes; from the user's point of view, the BList works just like a regular Python list. So you can see the performance of the BList in more detail, several performance graphs available at the following link: http://stutzbachenterprises.com/blist/ Feedback We're eager to hear about your experiences with the BList. Please send all feedback and bug reports to [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
bbfreeze 0.92.0
Hi all, I've just uploaded bbfreeze 0.92.0 to python's cheeseshop. bbfreeze creates standalone executables from python scripts. It's similar in functionality to py2exe or cx_Freeze. It offers the following features: easy installation bbfreeze can be installed with setuptools' easy_install command. binary dependency tracking bbfreeze will track binary dependencies and will include DLLs and shared libraries needed by a frozen program. multiple script freezing bbfreeze can freeze multiple scripts at once. python interpreter included bbfreeze will create an extra executable named 'py', which might be used like the python executable itself. bbfreeze works on windows and UNIX-like operating systems. It currently does not work on OS X. bbfreeze has been tested with python 2.4 and 2.5. bbfreeze will not work with python versions prior to 2.3 as it uses the zipimport feature introduced with python 2.3. Links cheese shop entry: http://cheeseshop.python.org/pypi/bbfreeze/ homepage: http://systemexit.de/bbfreeze/ mercurial repository: http://systemexit.de/repo/bbfreeze Regards, - Ralf -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
ANN: Webware 0.9.3 released
Webware 0.9.3 has been released. This release of Webware for Python includes a couple of fixes and improvements of WebKit and some cleanup of the overall Webware codebase. Please have a look at the WebKit release notes for details. Webware for Python is a suite of Python packages and tools for developing object-oriented, web-based applications. The suite uses well known design patterns and includes a fast Application Server, Servlets, Python Server Pages (PSP), Object-Relational Mapping, Task Scheduling, Session Management, and many other features. Webware is very modular and easily extended. Webware for Python is well proven and platform-independent. It is compatible with multiple web servers, database servers and operating systems. Check out the Webware for Python home page at http://www.w4py.org -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
pyqt4 signal/slot using PyObject* and shortcut
Hello, i have the following code: # import time import sys from PyQt4 import QtGui, QtCore class Counter(QtCore.QThread): def __init__(self): QtCore.QThread.__init__(self) def run(self): cntr = 0 while cntr 10: cntr += 1 self.emit(QtCore.SIGNAL(showCntr1(PyObject*)), (cntr, a)) # line 1 self.emit(QtCore.SIGNAL(showCntr2), (cntr, a)) # line 2 time.sleep(0.2) class Gui(QtGui.QDialog): def __init__(self, parent = None): QtGui.QDialog.__init__(self, parent) frameStyle = QtGui.QFrame.Sunken | QtGui.QFrame.Panel self.lCntr = QtGui.QLabel() self.lCntr.setFrameStyle(frameStyle) loGrd = QtGui.QGridLayout() loGrd.addWidget(self.lCntr, 0, 0) self.setLayout(loGrd) self.setWindowTitle(self.tr(Counter)) def showCntr1(self, val): print val, str(val) self.lCntr.setText(str(val)) def showCntr2(self, val): print val, str(val) self.lCntr.setText(str(val)) if __name__ == __main__: app = QtGui.QApplication(sys.argv) dialog = Gui() cntr = Counter() cntr.start() QtCore.QObject.connect(cntr, QtCore.SIGNAL(showCntr1(PyObject*)), dialog.showCntr1, QtCore.Qt.QueuedConnection) QtCore.QObject.connect(cntr, QtCore.SIGNAL(showCntr2), dialog.showCntr1, QtCore.Qt.QueuedConnection) sys.exit(dialog.exec_()) # If i comment out line 1, then i get the following output: 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Notice that 0.2 is the time value of the sleep instruction. Why is this happening? On the other hand, if i comment out line 2, then i get the following output: (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) What i get from the above is that a reference to cntr is being passed, but by the time the gui thread is actually run, both the values (cntr and a) have been destroyed, hence the NULL values. ***How do i circumvent this problem?*** Lastly, if i don't comment out any of line 1 or 2, then i get the foll output: (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, .. i don't know what this means??? Can anyone kindly explain what's happening... I'm using: python: 2.4.4~c1-0ubuntu1 qt4-dev-tools: not installed python-qt4: 4.0.1-1ubuntu1 sip4: (4.4.5-2ubuntu1 os: ubuntu edgy -- warm regards, Pradnyesh Sawant -- Be yourself, everyone else is taken. --Anon -- http://mail.python.org/mailman/listinfo/python-list
Re: webbrowser.open works in IDLE and cmd shell but not from cygwin prompt
On Apr 27, 5:09 am, Gregory Bloom [EMAIL PROTECTED] wrote: I'm running Python 2.5 under Windows. If I fire up IDLE and enter: import webbrowser url = 'http://www.python.org' webbrowser.open_new(url) it works like a champ, opening the page in Firefox. Same thing goes from a Windows cmd shell: it works as advertised. But if I open a cygwin bash shell and try the same thing from a python prompt, I get: import webbrowser url = 'http://www.python.org' webbrowser.open_new(url) Traceback (most recent call last): File stdin, line 1, in module File C:\Python25\lib\webbrowser.py, line 60, in open_new return open(url, 1) File C:\Python25\lib\webbrowser.py, line 55, in open if browser.open(url, new, autoraise): File C:\Python25\lib\webbrowser.py, line 185, in open p = subprocess.Popen(cmdline, close_fds=True, preexec_fn=setsid) File C:\Python25\lib\subprocess.py, line 551, in __init__ raise ValueError(close_fds is not supported on Windows ValueError: close_fds is not supported on Windows platforms What's up with that? And, more to the point, how can I use webbrowser from scripts launched under cygwin? I have X and kde for cygwin installed. If i use startxwin to start an xterm, without starting kde, and do the above in cygwins python version 2.4.3 i have to wait around 3 minutes then up pops konqueror at the requested page. - Paddy. -- http://mail.python.org/mailman/listinfo/python-list
Re: pyqt4 signal/slot using PyObject* and shortcut
On 4/27/07, Pradnyesh Sawant wrote: Hello, i have the following code: # import time import sys from PyQt4 import QtGui, QtCore class Counter(QtCore.QThread): def __init__(self): QtCore.QThread.__init__(self) def run(self): cntr = 0 while cntr 10: cntr += 1 self.emit(QtCore.SIGNAL(showCntr1(PyObject*)), (cntr, a)) # line 1 self.emit(QtCore.SIGNAL(showCntr2), (cntr, a)) # line 2 time.sleep(0.2) class Gui(QtGui.QDialog): def __init__(self, parent = None): QtGui.QDialog.__init__(self, parent) frameStyle = QtGui.QFrame.Sunken | QtGui.QFrame.Panel self.lCntr = QtGui.QLabel() self.lCntr.setFrameStyle(frameStyle) loGrd = QtGui.QGridLayout() loGrd.addWidget(self.lCntr, 0, 0) self.setLayout(loGrd) self.setWindowTitle(self.tr(Counter)) def showCntr1(self, val): print val, str(val) self.lCntr.setText(str(val)) def showCntr2(self, val): print val, str(val) self.lCntr.setText(str(val)) if __name__ == __main__: app = QtGui.QApplication(sys.argv) dialog = Gui() cntr = Counter() cntr.start() QtCore.QObject.connect(cntr, QtCore.SIGNAL(showCntr1(PyObject*)), dialog.showCntr1, QtCore.Qt.QueuedConnection) QtCore.QObject.connect(cntr, QtCore.SIGNAL(showCntr2), dialog.showCntr1, QtCore.Qt.QueuedConnection) There's a small bug in the above line, it should be dialog.showCntr2, and not dialog.showCntr1. However, even with this change, the output shown below remains the same :( sys.exit(dialog.exec_()) # If i comment out line 1, then i get the following output: 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Notice that 0.2 is the time value of the sleep instruction. Why is this happening? On the other hand, if i comment out line 2, then i get the following output: (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) What i get from the above is that a reference to cntr is being passed, but by the time the gui thread is actually run, both the values (cntr and a) have been destroyed, hence the NULL values. ***How do i circumvent this problem?*** Lastly, if i don't comment out any of line 1 or 2, then i get the foll output: (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, .. i don't know what this means??? Can anyone kindly explain what's happening... I'm using: python: 2.4.4~c1-0ubuntu1 qt4-dev-tools: not installed python-qt4: 4.0.1-1ubuntu1 sip4: (4.4.5-2ubuntu1 os: ubuntu edgy -- warm regards, Pradnyesh Sawant -- Be yourself, everyone else is taken. --Anon -- warm regards, Pradnyesh Sawant -- Be yourself, everyone else is taken. --Anon -- http://mail.python.org/mailman/listinfo/python-list
Re: EuroPython vs PyconUK
Alex Martelli wrote: I like the kudos, thanks!, but I'm not quite sure what you're saying about my travel plans... just to clarify, once again I'll have to miss EuroPython _and_ PythonUK, two events I attended most assiduously when I was living in Europe (but then, for two years running I've also missed PyCon, _despite_ living in the US, sigh). I was just using your possible travel plans as an example to express my concerns :P Re your effective travel plans, thanks God for Google Video then :D Cheers, EuGeNe -- http://www.3kwa.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Socket exceptions aren't in the standard exception hierarchy (M2Crypto issue)
On a related note, M2Crypto's exceptions are direct children of Exception. If we add NetworkError, there will be a better place to put them. Currently, you have to catch, at least, M2Crypto.SSL.Checker.SSLVerificationError M2Crypto.SSL.SSLError both of which can be raised by socket operations if M2Crypto is installed. I'm not sure what errors the stock SSL module raises. (I'm running stress tests on a dedicated machine in a colocation facility. It's examining 11,000 known spam and malware sites right now. This exercises the error handling, forcing many unusual cases and logging the problems. That's why I'm discovering all these library issues.) John Nagle Steve Holden wrote: John Nagle wrote: Steve Holden wrote: John Nagle wrote: Steve Holden wrote: John Nagle wrote: [socket.error bug report] All these notes should be included in the bug report, as I suspect the module would benefit from additional clarity. Done. See [ 1706815 ] socket.error exceptions not subclass of StandardError Also see [ 805194 ] Inappropriate error received using socket timeout [ 1019808 ] wrong socket error returned [ 1571878 ] Improvements to socket module exceptions [ 708927 ] socket timeouts produce wrong errors in win32 for related but not identical problems in that area. Thanks. At least this is less likely to be overlooked now. regards Steve -- http://mail.python.org/mailman/listinfo/python-list
Re: EuroPython vs PyconUK
Michele Simionato wrote: I don't see the problem. In my view EuroPython is the big event in Europe. If you can go to only one conference and you have the possibility to travel to Vilnius, then go to EuroPython. The national conferences are of interest primarily for people of that national (of course, not exclusively). Thanks, I didn't see it that way but that was ignorance on my behalf. I was WRONGLY under the impression that we were in front of a classical European pattern named what WE can do collectively I can do better alone - known use : European constitution :P (but I am digressing :D). BTW, this year I will go both to PyCon It and EuroPython, last year I went both to PyUK and EuroPython. The more, the better ;) The more the merrier indeed in that respect! I learnt a lot from your Using decorators talk last year. Thanks. EuGeNe -- http://www.3kwa.com -- http://mail.python.org/mailman/listinfo/python-list
regex question
hello,
i have a regex: rx_test = re.compile('/x([^x])*x/')
which is part of this test program:
import re
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
C:\testpython retest.py
['c']
can anyone point out why this is occurring? i can capture the entire
group by doing this:
rx_test = re.compile('/x([^x]+)*x/')
but why isn't the 'star' grabbing the whole group? and why isn't each
letter 'a', 'b', and 'c' present, either individually, or as a group
(group is expected)?
any clarification is appreciated!
sincerely,
proctor
--
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Re: My python annoyances so far
In [EMAIL PROTECTED], Steven Howe wrote: And before someone get's all technical, I know everything in Python is an 'object' even None, which implies class, or is it the other way around? Objects don't imply classes. There are object oriented languages without classes like the Io language. Everything there is an object and the base object has a `clone()` method to make a copy. So you make copies of objects and modify them to tweak them into the way you want them. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: passing tuple with pyqt4 signal/slot mechanism
On Friday 27 April 2007 1:20 am, Pradnyesh Sawant wrote: In the first version it didn't. In the second version it did. in my case, it didn't in the second version either??? The version of PyQt? The version of SIP? The version of Qt? python2.4: 2.4.4~c1-0ubuntu1 pyqt4: 4.0.1-1ubuntu1 python-sip4: 4.4.5-2ubuntu1 qt4: couldn't see just qt4 in aptitude ??? (have qt4-qtconfig installed though). qt4-dev-tools not installed (is that needed?) Then upgrade to a current version of PyQt. Phil -- http://mail.python.org/mailman/listinfo/python-list
video lectures on C, C++, Java, Python and other programming and Computer science.
Hi Friends, Check here http://freevideolectures.com/computerscience.html for video lectures on Programming languages like C, C++, Java, COBOL etc.., OS, Algorithms, Data Structures, RDBMS, Web designing, etc.. It also has amazing collection of video lectures and animations on all Engineering and Medical Sciences. I am sure you will be surprised to see such great collection. Do you like it??? -- http://mail.python.org/mailman/listinfo/python-list
Re: pyqt4 signal/slot using PyObject* and shortcut
On Friday 27 April 2007 7:05 am, Pradnyesh Sawant wrote: On 4/27/07, Pradnyesh Sawant wrote: Hello, i have the following code: # import time import sys from PyQt4 import QtGui, QtCore class Counter(QtCore.QThread): def __init__(self): QtCore.QThread.__init__(self) def run(self): cntr = 0 while cntr 10: cntr += 1 self.emit(QtCore.SIGNAL(showCntr1(PyObject*)), (cntr, a)) # line 1 self.emit(QtCore.SIGNAL(showCntr2), (cntr, a)) # line 2 time.sleep(0.2) class Gui(QtGui.QDialog): def __init__(self, parent = None): QtGui.QDialog.__init__(self, parent) frameStyle = QtGui.QFrame.Sunken | QtGui.QFrame.Panel self.lCntr = QtGui.QLabel() self.lCntr.setFrameStyle(frameStyle) loGrd = QtGui.QGridLayout() loGrd.addWidget(self.lCntr, 0, 0) self.setLayout(loGrd) self.setWindowTitle(self.tr(Counter)) def showCntr1(self, val): print val, str(val) self.lCntr.setText(str(val)) def showCntr2(self, val): print val, str(val) self.lCntr.setText(str(val)) if __name__ == __main__: app = QtGui.QApplication(sys.argv) dialog = Gui() cntr = Counter() cntr.start() QtCore.QObject.connect(cntr, QtCore.SIGNAL(showCntr1(PyObject*)), dialog.showCntr1, QtCore.Qt.QueuedConnection) QtCore.QObject.connect(cntr, QtCore.SIGNAL(showCntr2), dialog.showCntr1, QtCore.Qt.QueuedConnection) There's a small bug in the above line, it should be dialog.showCntr2, and not dialog.showCntr1. However, even with this change, the output shown below remains the same :( sys.exit(dialog.exec_()) # If i comment out line 1, then i get the following output: 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Notice that 0.2 is the time value of the sleep instruction. Why is this happening? On the other hand, if i comment out line 2, then i get the following output: (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) (refcnt 0 at 0xb7dcd28c, 'a') (NULL, NULL) What i get from the above is that a reference to cntr is being passed, but by the time the gui thread is actually run, both the values (cntr and a) have been destroyed, hence the NULL values. ***How do i circumvent this problem?*** Lastly, if i don't comment out any of line 1 or 2, then i get the foll output: (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, (__main__.Gui object at 0xb6a8f12c, .. i don't know what this means??? Can anyone kindly explain what's happening... I'm using: python: 2.4.4~c1-0ubuntu1 qt4-dev-tools: not installed python-qt4: 4.0.1-1ubuntu1 sip4: (4.4.5-2ubuntu1 os: ubuntu edgy As I said in the other thread, upgrade to a current release of PyQt. Also PyObject* should no longer be used in signal signatures - use PyQt_PyObject instead. Phil -- http://mail.python.org/mailman/listinfo/python-list
RE:: Re-ocurring Events
Thank you guys for your suggestions. I've been having a look at that launchd stuff from apple but couldnt really see how that applies to my requirements. I've been putting some serious thought into how this should work as its essentially the final part of the puzzle for my application, I'll have a fully working model for my application. I've been thinking about the possibility of using a combination of xpath to search the XML with some loops which change the date. As events won't ever be set to start before 01-01-2007 I can set that as the ceiling for my loop. So when I'm searching for weekly events, I 'simply' take today's date and time and loop from now until 01-01-2007 decrementing the date by a week each iteration of the loop and then search the XML for events in that date, make sense? I know that's a fairly intensive way of doing it, but if it works it works. Now, the loop is where I'm really struggling, I've not done any looping with dates, can anyone give me a hand with this? How can I loop back in time from now to beginning of 07 a week at a time? Do we have some form of dateAdd() I can use with a while loop? Perhaps. Date = (now) While date 2007-01-01: Date = dateAdd(date, -1, w) Something to that effect? Then I can quickly xpath for every iteration of the loop. Thanks guys for any help. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Laurent Pointal Sent: 26 April 2007 15:33 To: python-list@python.org Subject: Re: Re-ocurring Events Daniel Nogradi a écrit : A bit more of a complex one this time, and I thought I'd get your opinions on the best way to achieve this. Basically I'm looking for a way to describe a re-occurring event, like a calendar event or appointment I guess. I'm likely to use an XML file for the definition of the events, but imagine I've got an event that looks something like this. event start=2007-01-01 12:00:00 end=2007-01-01 15:00:00 repeat=daily / May take a look at launchd (Apple) XML dialect, it may have at least the semantic for your need. For other parts... elementtree, yes. Now what I want to do is be able to build a class which has a function like 'getCurrentEvent()' which will return any events that should be occurring at that time. So if the current system time and date is 2007-01-03 13:00:00 then it will return THAT event to me, but if it was say 2007-01-03 16:00:00 then it would not, as the event isn't 'due' to occur at that time. Make sense? What's the best way of handling this? I'm really a little lost as to how I might get started, checking a static date time isn't a problem, it's when it comes to these re-occurring events that I struggle a little. The idea is that I would have 5 core repetitions, none, daily, weekly, monthly and annually. This will not solve all your problems, but a very convenient way of handling XML is the element tree module (that comes with python 2.5): http://docs.python.org/lib/module-xml.etree.ElementTree.html HTH, Daniel -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Feedback on Until recipe
On 2007-04-26, MRAB [EMAIL PROTECTED] wrote: At http://mail.python.org/pipermail/python-dev/2006-February/060718.html Raymond Hettinger suggested removing the final colon after the 'while' if there's no statement after it, which I agree with, although I would prefer 'repeat' instead of 'do' (IMHO that doesn't suggest repetition clearly enough): repeat: statements while condition: statements and: repeat: statements while condition I wouldn't object to this. But more important than how it will look like IMO is that it gets implemented. Acoording to your URL there is little chance that this will be implemented before Py3k. A pity. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
proctor wrote:
i have a regex: rx_test = re.compile('/x([^x])*x/')
You probably want...
rx_test = re.compile('/x([^x]*)x/')
- Josiah
--
http://mail.python.org/mailman/listinfo/python-list
Re: regex question
On Apr 27, 1:33 am, proctor [EMAIL PROTECTED] wrote:
hello,
i have a regex: rx_test = re.compile('/x([^x])*x/')
which is part of this test program:
import re
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
C:\testpython retest.py
['c']
can anyone point out why this is occurring? i can capture the entire
group by doing this:
rx_test = re.compile('/x([^x]+)*x/')
but why isn't the 'star' grabbing the whole group? and why isn't each
letter 'a', 'b', and 'c' present, either individually, or as a group
(group is expected)?
any clarification is appreciated!
sincerely,
proctor
As Josiah already pointed out, the * needs to be inside the grouping
parens.
Since re's do lookahead/backtracking, you can also write:
rx_test = re.compile('/x(.*?)x/')
The '?' is there to make sure the .* repetition stops at the first
occurrence of x/.
-- Paul
--
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List objects are un-hashable
Hi, I'm trying to search and print any no# of Python keywords present in a text file (say - foo.txt), and getting the above error. Sad for not being able to decipher such a simple problem (I can come up with other ways - but want to fix this one FFS). Any help is appreciated. Thanks!! import keyword, re, sys, string inp = open(foo.txt, r) words,lines = 0, 0 for line in inp: lines +=1 # a list of words tempwords = line.split(None) if keyword.iskeyword(tempwords): print tempwords inp.close() -- http://mail.python.org/mailman/listinfo/python-list
RE: : Re-ocurring Events
Just as another quick update, I've found this module for python that may be able to help me, its designed to spot date patterns for things like recurring events I guess, http://www.biostat.wisc.edu/~annis/creations/period.py.html Quite how I can integrate it into my project I'm not sure but if I can loop through each of the events in my XML and see if they are meant to be recurring today then that's fantastic. If anyone has any rough ideas on how this might work for me I'd love to hear some rough concepts. Thanks, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Rawlins - Think Blue Sent: 27 April 2007 08:24 To: python-list@python.org Subject: RE:: Re-ocurring Events Thank you guys for your suggestions. I've been having a look at that launchd stuff from apple but couldnt really see how that applies to my requirements. I've been putting some serious thought into how this should work as its essentially the final part of the puzzle for my application, I'll have a fully working model for my application. I've been thinking about the possibility of using a combination of xpath to search the XML with some loops which change the date. As events won't ever be set to start before 01-01-2007 I can set that as the ceiling for my loop. So when I'm searching for weekly events, I 'simply' take today's date and time and loop from now until 01-01-2007 decrementing the date by a week each iteration of the loop and then search the XML for events in that date, make sense? I know that's a fairly intensive way of doing it, but if it works it works. Now, the loop is where I'm really struggling, I've not done any looping with dates, can anyone give me a hand with this? How can I loop back in time from now to beginning of 07 a week at a time? Do we have some form of dateAdd() I can use with a while loop? Perhaps. Date = (now) While date 2007-01-01: Date = dateAdd(date, -1, w) Something to that effect? Then I can quickly xpath for every iteration of the loop. Thanks guys for any help. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Laurent Pointal Sent: 26 April 2007 15:33 To: python-list@python.org Subject: Re: Re-ocurring Events Daniel Nogradi a écrit : A bit more of a complex one this time, and I thought I'd get your opinions on the best way to achieve this. Basically I'm looking for a way to describe a re-occurring event, like a calendar event or appointment I guess. I'm likely to use an XML file for the definition of the events, but imagine I've got an event that looks something like this. event start=2007-01-01 12:00:00 end=2007-01-01 15:00:00 repeat=daily / May take a look at launchd (Apple) XML dialect, it may have at least the semantic for your need. For other parts... elementtree, yes. Now what I want to do is be able to build a class which has a function like 'getCurrentEvent()' which will return any events that should be occurring at that time. So if the current system time and date is 2007-01-03 13:00:00 then it will return THAT event to me, but if it was say 2007-01-03 16:00:00 then it would not, as the event isn't 'due' to occur at that time. Make sense? What's the best way of handling this? I'm really a little lost as to how I might get started, checking a static date time isn't a problem, it's when it comes to these re-occurring events that I struggle a little. The idea is that I would have 5 core repetitions, none, daily, weekly, monthly and annually. This will not solve all your problems, but a very convenient way of handling XML is the element tree module (that comes with python 2.5): http://docs.python.org/lib/module-xml.etree.ElementTree.html HTH, Daniel -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: List objects are un-hashable
Andy [EMAIL PROTECTED] writes: Hi, I'm trying to search and print any no# of Python keywords present in a text file (say - foo.txt), and getting the above error. Sad for not being able to decipher such a simple problem (I can come up with Without looking at the docs, it seems save to assume keywords.iskeyword would expect a string. You pass it a list. other ways - but want to fix this one FFS). Any help is appreciated. Thanks!! import keyword, re, sys, string inp = open(foo.txt, r) words = sum(1 for line in inp for w in line.split() if keyword.iskeyword(w)) 'as -- http://mail.python.org/mailman/listinfo/python-list
Re: List objects are un-hashable
for line in inp: lines +=1 # a list of words tempwords = line.split(None) if keyword.iskeyword(tempwords): print tempwords You are trying here to ask if a list of words (tempwords) is a keyword. The error is due to the implementation of the iskeyword function which converts the keyword list into a frozenset (in which elements must be hashable) for, I presume, performance reasons: f_set = frozenset((1,2,3,4)) [test] in f_set Traceback (most recent call last): File stdin, line 1, in module TypeError: list objects are unhashable What you want is something like: for line in inp: lines +=1 # a list of words tempwords = line.split() for k in tempwords: if keyword.iskeyword(k): print tempwords Which iterates over each word in your tempwords list in turn. Note though the following: if(True):printHey! ... Hey! s = 'if(True):printHey!' s.split() ['if(True):printHey!'] Which may be a problem for you if you are trying to parse badly spaced python source files! -- http://mail.python.org/mailman/listinfo/python-list
Re: List objects are un-hashable
What you want is something like: for line in inp: lines +=1 # a list of words tempwords = line.split() for k in tempwords: if keyword.iskeyword(k): print tempwords I think it should be: if keyword.iskeyword(k): print k -- http://mail.python.org/mailman/listinfo/python-list
Re: List objects are un-hashable
I think it should be: if keyword.iskeyword(k): print k Whoops - yes of course! -- http://mail.python.org/mailman/listinfo/python-list
Re: List objects are un-hashable
Andy == Andy [EMAIL PROTECTED] writes: if keyword.iskeyword(tempwords): print tempwords for word in tempwords: if keyword.iskeyword(word): print word Ganesan -- Ganesan Rajagopal -- http://mail.python.org/mailman/listinfo/python-list
Re: List objects are un-hashable
Andy wrote: Hi, I'm trying to search and print any no# of Python keywords present in a text file (say - foo.txt), and getting the above error. Sad for not being able to decipher such a simple problem (I can come up with other ways - but want to fix this one FFS). It helps a lot of if you post the traceback with your problem. The line it occurred on is crucial for debugging. But I will use my psychic debugger which tells me that the error is here: if keyword.iskeyword(tempwords): tempwords is a list. You need to iterate over the contents of the list and run keyword.iskeyword() for each one. Here's an example for Python 2.5. I've cleaned up some extra lines of code that didn't have any eventual effects in your current implementation from __future__ import with_statement import keyword INFILENAME = foo.txt with open(INFILENAME) as infile: for line in infile: words = line.split() for word in words: if keyword.iskeyword(word): print word This will print multiple lines per input line. If you wanted one line per input line then try: with open(INFILENAME) as infile: for line in infile: words = line.split() print .join(word for word in words if keyword.iskeyword(word)) -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
RE: Re-ocurring Events
Thanks for getting back to me Laurent. I've now made some pretty tidy progress on this and -think- it's going to shape up nicely, I'm just working on converting my date strings from the XML into a date_struct and we should be good to go. I'll keep you all posted. Rob -Original Message- From: Laurent Pointal [mailto:[EMAIL PROTECTED] Sent: 27 April 2007 09:49 To: Robert Rawlins - Think Blue Subject: Re: Re-ocurring Events Robert Rawlins - Think Blue a écrit : Thank you guys for your suggestions. I've been having a look at that launchd stuff from apple but couldnt really see how that applies to my requirements. I was not thinking about launchd itself, but about its XML configuration files which manage timed events, as you need. I've been putting some serious thought into how this should work as its essentially the final part of the puzzle for my application, I'll have a fully working model for my application. I've been thinking about the possibility of using a combination of xpath to search the XML with some loops which change the date. As events won't ever be set to start before 01-01-2007 I can set that as the ceiling for my loop. So when I'm searching for weekly events, I 'simply' take today's date and time and loop from now until 01-01-2007 decrementing the date by a week each iteration of the loop and then search the XML for events in that date, make sense? I know that's a fairly intensive way of doing it, but if it works it works. Now, the loop is where I'm really struggling, I've not done any looping with dates, can anyone give me a hand with this? How can I loop back in time from now to beginning of 07 a week at a time? Do we have some form of dateAdd() I can use with a while loop? Perhaps. See datetime module, eventually third party mxDatetime. Date = (now) While date 2007-01-01: Date = dateAdd(date, -1, w) Something to that effect? Then I can quickly xpath for every iteration of the loop. A+ Laurent. -- Laurent POINTAL CNRS-LIMSI dépt. CHM, groupes AMI et PS Courriel: [EMAIL PROTECTED](prof) [EMAIL PROTECTED] (perso) Ouebe: http://www.limsi.fr/Individu/pointal/ Tél. 01 69 85 81 06 (prof) Fax. 01 69 85 80 88 -- http://mail.python.org/mailman/listinfo/python-list
Re: Tutorial creates confusion about slices
On 2007-04-26, Steve Holden [EMAIL PROTECTED] wrote: Antoon Pardon wrote: On 2007-04-25, Steve Holden [EMAIL PROTECTED] wrote: [...] Most people reading a tutorial are aware that they are being given the knowledge they need to put the subject matter to immediate use, and that there may well be refinements that are glossed over or covered in detail later or elsewhere. I agree with that. However there is a difference between information that will help you on the way now that will be refined later and information that will help you on the way now and will be contradicted later. I also understand that the line between the two is rather fuzzy. In my opinion the text in the tutorial as it stands now, is more of the latter than of the former type and that is why I would prefer a change. I had already deduced that from your arguments so far in this thread. Do you *have* to make every trivial conclusion explicit? Well my problem was I had the feeling your remark totally ignored that. I honestly don't understand what you thought your remark would contribute if you had deduced the above. It is very possible that this is a failing of mine in recognizing when people have understood the point I am trying to make. Warning: this is an explicit test to see whether you can sit on your hands and refrain from replying. It's hard to find a thread where you don't make the last comment on every branch you get involved in. Well I guess I failed. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: key detect
Alex Taslab wrote: Hi everybody, does anyone know how to detect a key press from a keyboard. Well I do know how to do that, but i need to detect just one press and ignore the others. I mean, my program checks an input from the outside (a sensor) and i emulate that signal as a keypress, but the sensor doesn`t send the signal as a unique pulse y just keeps sending signal during some seconds, so that is like to be pressing one key for a period of time. How can i take that first press of a key and ignore the others? I am using pygtk. thanks everybody! Perhaps you could emulate the sensor-signal as something else than a keypress, perhaps pipe the event-data into some temporary file or so. H. -- http://mail.python.org/mailman/listinfo/python-list
Re: webbrowser.open works in IDLE and cmd shell but not from cygwin prompt
Gregory Bloom wrote: I'm running Python 2.5 under Windows. If I fire up IDLE and enter: import webbrowser url = 'http://www.python.org' webbrowser.open_new(url) it works like a champ, opening the page in Firefox. Same thing goes from a Windows cmd shell: it works as advertised. But if I open a cygwin bash shell and try the same thing from a python prompt, I get: import webbrowser url = 'http://www.python.org' webbrowser.open_new(url) Traceback (most recent call last): File stdin, line 1, in module File C:\Python25\lib\webbrowser.py, line 60, in open_new return open(url, 1) File C:\Python25\lib\webbrowser.py, line 55, in open if browser.open(url, new, autoraise): File C:\Python25\lib\webbrowser.py, line 185, in open p = subprocess.Popen(cmdline, close_fds=True, preexec_fn=setsid) File C:\Python25\lib\subprocess.py, line 551, in __init__ raise ValueError(close_fds is not supported on Windows ValueError: close_fds is not supported on Windows platforms What's up with that? It's not a Cygwin issue, really. This occurs when one of [firefox, firebird, seamonkey, mozilla, netscape, opera] is in your path. Your Cygwin environment must be set so one of these is in your path when it isn't normally. You should also submit a bug. And, more to the point, how can I use webbrowser from scripts launched under cygwin? If you're using native Windows Python as you seem to be, try webbrowser.get(windows-default).open_new(url) If you want to use Cygwin Python instead, I submitted a patch more than 1.5 years ago to allow it, but it hasn't been reviewed: http://python.org/sf/1244861 -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
How can I save command prompt screen
Hi ,
I run a python acript with os.system('script.py')
I want save command prompt screen in a text file (everything ) how
can I do this?
Thanks for your help
Ozan
--
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what python technology for my app?
I have an database containing lots of numerical data. I want to write a browser based interface that will allow selection of various key parameters and yield tables, plots and/or printouts of the data according to the selections. Ultimately I want this to run on an intranet so that others can get access via their browsers. The application is for in-house use only and not likely to have more than a few users at any one time. I've managed to hack out enough understanding of sql and sqlAlchemy over the last couple of days to create and access an sqlite3 based database for my data. This seems to suit my purposes for now. Now for a front end and some simple distribution over a network. I have written some small Wxpython matplotlib apps for data analysis and display but I'm not sure how these would work in a browser based world, or even if they are appropriate. Any advice on what technologies I should be looking at for this? Python based naturally, and hopefully simple and lightweight. I'm not a programmer by trade and that's not what I really get paid for but I've learned to love python and its myriad of modules for all the data analysis work I need to do. If I can throw something moderately functional together in a week or two (along with all the learning that entails) I'll be happy. btw - Platform needs to be windows because that's what on my desk. thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
[EMAIL PROTECTED] a écrit : (snip) Well, why do some things in the library have to be functions, and other things have to be class methods? Why aren't they all just either functions or class methods? like perhaps ruby. If I tell you that Python's functions are in fact static methods of their module, will this make you happy ? Because, while not technically true, this is conceptually equivalent. Or if you prefer to stick to technical truth, python's methods are nothing more than a thin decorator around a function object (yes, Python's functions *are* objects) - so in fact, there are *only* functions - sometimes wrapped into a method object, sometimes not, depending on how you access them. In both cases, the fact that you don't have enough knowledge of a language to understand it's design, and/or the fact that this design is different from other one you already know, doesn't by itself make this design an annoyance. -- http://mail.python.org/mailman/listinfo/python-list
RE: Re-ocurring Events
Ok, Almost done now, it seems to be working a real charm at the moment. I need a little help on performing a quick if statement against a date string. I have couple of date strings returned by s.attributes.getNamedItem(start).nodeValue s.attributes.getNamedItem(end).nodeValue and I need to do and conditional that ensures start is before today's date/time and end is after today's date/time. The string looks like: '2007-01-01 00:00:00' Do I have to convert this to a proper time object to do the comparison? Or can I do it as a string? Thanks, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Rawlins - Think Blue Sent: 27 April 2007 09:55 To: 'Laurent Pointal' Cc: python-list@python.org Subject: RE: Re-ocurring Events Thanks for getting back to me Laurent. I've now made some pretty tidy progress on this and -think- it's going to shape up nicely, I'm just working on converting my date strings from the XML into a date_struct and we should be good to go. I'll keep you all posted. Rob -Original Message- From: Laurent Pointal [mailto:[EMAIL PROTECTED] Sent: 27 April 2007 09:49 To: Robert Rawlins - Think Blue Subject: Re: Re-ocurring Events Robert Rawlins - Think Blue a écrit : Thank you guys for your suggestions. I've been having a look at that launchd stuff from apple but couldnt really see how that applies to my requirements. I was not thinking about launchd itself, but about its XML configuration files which manage timed events, as you need. I've been putting some serious thought into how this should work as its essentially the final part of the puzzle for my application, I'll have a fully working model for my application. I've been thinking about the possibility of using a combination of xpath to search the XML with some loops which change the date. As events won't ever be set to start before 01-01-2007 I can set that as the ceiling for my loop. So when I'm searching for weekly events, I 'simply' take today's date and time and loop from now until 01-01-2007 decrementing the date by a week each iteration of the loop and then search the XML for events in that date, make sense? I know that's a fairly intensive way of doing it, but if it works it works. Now, the loop is where I'm really struggling, I've not done any looping with dates, can anyone give me a hand with this? How can I loop back in time from now to beginning of 07 a week at a time? Do we have some form of dateAdd() I can use with a while loop? Perhaps. See datetime module, eventually third party mxDatetime. Date = (now) While date 2007-01-01: Date = dateAdd(date, -1, w) Something to that effect? Then I can quickly xpath for every iteration of the loop. A+ Laurent. -- Laurent POINTAL CNRS-LIMSI dépt. CHM, groupes AMI et PS Courriel: [EMAIL PROTECTED](prof) [EMAIL PROTECTED] (perso) Ouebe: http://www.limsi.fr/Individu/pointal/ Tél. 01 69 85 81 06 (prof) Fax. 01 69 85 80 88 -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
Marc 'BlackJack' Rintsch a écrit : In [EMAIL PROTECTED], Steven Howe wrote: And before someone get's all technical, I know everything in Python is an 'object' even None, which implies class, or is it the other way around? Objects don't imply classes. There are object oriented languages without classes like the Io language. Everything there is an object and the base object has a `clone()` method to make a copy. So you make copies of objects and modify them to tweak them into the way you want them. And FWIW, in Python, classes are objects too, and are attributes of their instances. Which makes Python quite close to prototype-based languages like Io, Self or Javascript. -- http://mail.python.org/mailman/listinfo/python-list
Re: *** Dr G Polya BRILLIANTLY analyses the Virgina Shooting Incident ***
[EMAIL PROTECTED] wrote: On Apr 24, 2:09 pm, Quadibloc [EMAIL PROTECTED] wrote: The Real Andy wrote: Makes me wonder about the credibility of any statement Dr Gideon Polya makes. . I never thought that I would feel the urge to call someone an edelweiss-eating Tanzanian devil, but Dr. Polya proved that I lacked imagination. (Note that Tanzanian is pronounced Tan.zan._ee_.yan, not Tan._zayn_.ee.an; one wouldn't want to spoil the effect.) What really spoils the effect is that Dr. Polya lives in Tasmania, a state of Australia, and not in Tanzania, which is a country in East Africa. Semi-literate Americans do tend to confuse the two places, as they also tend confuse Australia and Austria. Oddly enough, edelweiss grows in Austria, so Dr. Polya would have to import it from Europe if he were in the habit of dining on edelweiss - which would be an eccentric habit, even in Austria, where the flower doesn't form part of the normal diet. -- Bill Sloman, Nijmegen Is there any civilized life in Tasmania? It looks like just another natural wonderland that was raped, pillaged, exploited for its resources, and left behind. Even the official tourism site makes the place seem dull and bereft of any kind of enthusiasm, warning the prospective visitor that life is slow there. I did not know Erol Flynn was from there. That's something anyway. They might consider making his boyhood home a museum or something. And was that Gunn Forestry you know so well? -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
7stud a écrit : [EMAIL PROTECTED] wrote: Annoyances: Every language has annoyances. Python is no exception. Sure. But we may disagree on what are actually Python's annoyances !-) Post away. Anyone that is offended can go drink a Guinness. 1. Underscores! What's the deal with that? Especially those double underscores. The best answer I read on this is that the double underscores denotes special methods that the interpreter may automatically use. For example, 4+4 get expanded by the interpreter to 4.__add__(4). I thought those were pretty ugly myself. Now, I am used to them. FWIW, you shouldn't have to directly use __magic__ methods - or only in very special corner cases. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to find complementary colour for pixel
Steven D'Aprano a écrit : I shouldn't think so... I always forget if black is all ones or all zeroes, so I checked here: http://www.pitt.edu/~nisg/cis/web/cgi/rgb.html For this I use the mnemotechnics idea of chromatic coil [*], when there are *all* colors turning it appear to be *white*. And *no* color is then *black*. [*] Babelfish translation for french roue chromatique -- http://mail.python.org/mailman/listinfo/python-list
Re: How to find complementary colour for pixel
On Thu, 26 Apr 2007 21:17:42 -0700, James Stroud wrote: Johny wrote: I use PIL to write some text to a picture.The text must be seen wery clearly. I write the text to different pictures but to the same position. As pictures maybe different, colour, in the position where I write the text, is also different. Is there a way how to set the font colour so that it will be seen very clearly in the picture? For example, if the picture is bright ( for example yellow), the font colour should be dark( e.g. black) and vice versa. Is there a routine in PIL available that calculates complementary colour for RGB pixel format? Can anyone help? Thanks L. Don't you just xor with black? I shouldn't think so... I always forget if black is all ones or all zeroes, so I checked here: http://www.pitt.edu/~nisg/cis/web/cgi/rgb.html black = 0x00 # RGB colours white = 0xff black^black == white False white^black == black False Maybe you meant xor with white? But even so, I gather that the Original Poster is asking for something slightly different -- despite his mention of complimentary colours. (Or maybe I'm just reading too much into it?) I think he's just looking for one colour which has high contrast over a bunch of pixels in an image. I don't think that can be done, in general: it seems to me he's assuming that all the pixels in the area he wants to overlay text on are nearly the same colour. I think that a better solution is to draw a box around the area you want to write text into. The box should have a contrasting frame: say, a thin white border followed by a thin black border just inside it: either the white or the black will contrast with the background, no matter what colour(s) the background is, since no area can be both black and white in the same place. Then fill the frame with white, and draw black text inside it. Nice high contrast. That is probably the most readable method of placing text over an image. -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: what python technology for my app?
Chris a écrit : I have an database containing lots of numerical data. I want to write a browser based interface that will allow selection of various key parameters and yield tables, plots and/or printouts of the data according to the selections. Ultimately I want this to run on an intranet so that others can get access via their browsers. The application is for in-house use only and not likely to have more than a few users at any one time. I've managed to hack out enough understanding of sql and sqlAlchemy over the last couple of days to create and access an sqlite3 based database for my data. This seems to suit my purposes for now. Now for a front end and some simple distribution over a network. I have written some small Wxpython matplotlib apps for data analysis and display but I'm not sure how these would work in a browser based world, or even if they are appropriate. wxPython being a GUI toolkit, it's of course not really appropriate for a web-based solution (and yes, this is an understatement). I don't have any experience with matplotlib, but according to the project's FAQ, this shouldn't be a problem: http://matplotlib.sourceforge.net/faq.html#BATCHMODE Any advice on what technologies I should be looking at for this? Python based naturally, and hopefully simple and lightweight. I'm not a programmer by trade and that's not what I really get paid for but I've learned to love python and its myriad of modules for all the data analysis work I need to do. If I can throw something moderately functional together in a week or two (along with all the learning that entails) If you don't have any experience with web programming, it might take a bit more time. I'll be happy. Pylons (http://pylonshq.com) and turbogears are two great web frameworks. Both support SQLAlchemy. My own favourite is Pylons, but you should try both and choose the one that better fits your brain. btw - Platform needs to be windows because that's what on my desk. Python is mostly platform independant. HTH -- http://mail.python.org/mailman/listinfo/python-list
RE: what python technology for my app?
Just thought I'd make a little suggestion about this, I dont know how strict you want to be with the web development side of things, but I'm a web developer by trade and have recently started using python for my non-web type applications. If you're looking for a web based server side solution, then you can't go wrong with Adobe ColdFusion. Its and incredibly powerful and scalable development platform and yet supports a simple tag based language which makes life very easy when getting started, and yet will support much more complex OOP methodology with a whole myriad of frameworks, orm's and object factories. For a quick 'run down' of its features take a look at the simple tutorials on the adobe site, they'll demonstrate how easy it is to achieve even quite complex tasks like PDF creation, animated statistical charts an all sorts. As CF is a JAVA based technology you get the power of J2EE platform and its perfectly multi platform playing nicely with linux, unix, sun, windows or whatever server environment you wish to run it on. Just my two pence, I'm a big CF fan so my opinions are no doubt bias, but might be worth you taking a look. http://www.adobe.com/uk/products/coldfusion/ Pay attention to the 'ColdFusion Demos' at the bottom right of the main column. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bruno Desthuilliers Sent: 27 April 2007 12:19 To: python-list@python.org Subject: Re: what python technology for my app? Chris a écrit : I have an database containing lots of numerical data. I want to write a browser based interface that will allow selection of various key parameters and yield tables, plots and/or printouts of the data according to the selections. Ultimately I want this to run on an intranet so that others can get access via their browsers. The application is for in-house use only and not likely to have more than a few users at any one time. I've managed to hack out enough understanding of sql and sqlAlchemy over the last couple of days to create and access an sqlite3 based database for my data. This seems to suit my purposes for now. Now for a front end and some simple distribution over a network. I have written some small Wxpython matplotlib apps for data analysis and display but I'm not sure how these would work in a browser based world, or even if they are appropriate. wxPython being a GUI toolkit, it's of course not really appropriate for a web-based solution (and yes, this is an understatement). I don't have any experience with matplotlib, but according to the project's FAQ, this shouldn't be a problem: http://matplotlib.sourceforge.net/faq.html#BATCHMODE Any advice on what technologies I should be looking at for this? Python based naturally, and hopefully simple and lightweight. I'm not a programmer by trade and that's not what I really get paid for but I've learned to love python and its myriad of modules for all the data analysis work I need to do. If I can throw something moderately functional together in a week or two (along with all the learning that entails) If you don't have any experience with web programming, it might take a bit more time. I'll be happy. Pylons (http://pylonshq.com) and turbogears are two great web frameworks. Both support SQLAlchemy. My own favourite is Pylons, but you should try both and choose the one that better fits your brain. btw - Platform needs to be windows because that's what on my desk. Python is mostly platform independant. HTH -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
James Stroud wrote: Here is something on which to meditate: classes become functions when you get the quantum mechanics just so! s/become/can behave like/ :) Regards, Björn -- BOFH excuse #27: radiosity depletion -- http://mail.python.org/mailman/listinfo/python-list
Re: Re-ocurring Events
Robert Rawlins - Think Blue napisał(a): and I need to do and conditional that ensures start is before today's date/time and end is after today's date/time. The string looks like: '2007-01-01 00:00:00' Do I have to convert this to a proper time object to do the comparison? Or can I do it as a string? In the very specific case of string formatted as above, the string comparison will give the same results as in the case of datetime objects comparison. You just have to compare the same kinds of things. ;) -- Jarek Zgoda We read Knuth so you don't have to. -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
Steven D'Aprano wrote: Perhaps you should read about the Kingdom of Nouns: http://steve-yegge.blogspot.com/2006/03/ execution-in-kingdom-of-nouns.html Really cool. :) Thanks for sharing the link. Regards, Björn -- BOFH excuse #118: the router thinks its a printer. -- http://mail.python.org/mailman/listinfo/python-list
RE: Re-ocurring Events
Thanks for that tip Jarek, It worked a charm, I just created a format time string and used that in the compare against my XML and it work perfectly. Thank you, Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jarek Zgoda Sent: 27 April 2007 13:01 To: python-list@python.org Subject: Re: Re-ocurring Events Robert Rawlins - Think Blue napisał(a): and I need to do and conditional that ensures start is before today's date/time and end is after today's date/time. The string looks like: '2007-01-01 00:00:00' Do I have to convert this to a proper time object to do the comparison? Or can I do it as a string? In the very specific case of string formatted as above, the string comparison will give the same results as in the case of datetime objects comparison. You just have to compare the same kinds of things. ;) -- Jarek Zgoda We read Knuth so you don't have to. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Multiple select in wx.GenericDirCrtl
Hi! Is it possible to do multiple file selections in a wx.GenericDirCtrl?? Thanks, Soren -- http://mail.python.org/mailman/listinfo/python-list
creating an object from base class
i wish to have some extended functionality added to sockets i can create my own socket class class mysocket(socket.socket): and all should be fine. Except, the sockets are created for me by the accept method, listening on port. So how can i take the standard socket created for me and create a 'mysocket'. I need a method that will initialise any new properties i have added in my class, but how can i change the class of the socket created? -- http://mail.python.org/mailman/listinfo/python-list
Re: Generalized range
On Apr 27, 1:32 am, [EMAIL PROTECTED] (Alex Martelli) wrote: Michael Hoffman [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Thanks - you have covered a fair bit of gorund here - I will modify myRange taking your suggestions into account. The one suggestion that I'm going to have to think through is repeatedly incrementing res. I deliberately did not use this as repeated addition can cause rounding errors to accumulate, making the loop run a little longer or shorter than necessary. I thought I would be far less likely to run into rounding issues with a multiplicative construct - hence my use of epsilon, and my question about an appropriate value for it You are right about rounding issues--with a sufficiently small step, the way I have done it, it could become an infinite loop. But you can still do it with multiplication, without using an epsilon constant. How about something like this: index = 0 while res maximum: yield minimum + (step * index) index += 1 Absolutely (with your later correction of actually assigning res), MUCH better than the misguided attempts based on repeatedly adding 'step'. I've taught numerical computing in university, and I would have had to fail anybody who'd misunderstood floating-point computations badly enough to try that +=step idea (including, sigh, the coders of several Fortran compilers who were popular at that time). You may be referring to the Fortran DO loop with a REAL loop variable, for example do x=1.5,3.5,0.5 print*,x end do This was part of standard Fortran 77, so one should blame the standards committee, not the compiler writers. Very few features of F77 were deleted in Fortran 95, but this was one of them. In practice, nothing gets deleted from commercial Fortran compilers. At the SciPy site http://www.scipy.org/Cookbook/OptimizationAndFitDemo1 there is some code 1 from enthought.chaco.wx import plt 2 from scipy import arange, optimize, special 3 4 plt.figure() 5 plt.hold() 6 w = [] 7 z = [] 8 x = arange(0,10,.01) 9 10 for k in arange(1,5,.5): 11y = special.jv(k,x) 12plt.plot(x,y) 13f = lambda x: -special.jv(k,x) 14x_max = optimize.fminbound(f,0,6) 15w.append(x_max) 16z.append(special.jv(k,x_max)) 17 18 plt.plot(w,z, 'ro') 19 from scipy import interpolate 20 t = interpolate.splrep(w, z, k=3) 21 s_fit3 = interpolate.splev(x,t) 22 plt.plot(x,s_fit3, 'g-') 23 t5 = interpolate.splrep(w, z, k=5) 24 s_fit5 = interpolate.splev(x,t5) 25 plt.plot(x,s_fit5, 'y-') I think the use of arange with a non-integer increment is poor style, for reasons discussed in this thread. -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
On 26 Apr, 21:50, Bjoern Schliessmann usenet- [EMAIL PROTECTED] wrote: like perhaps ruby. If I were rude, I would ask now why you don't use ruby. But I bet ruby has some annoyances ready for you too. Regards, Björn Well, I'd use ruby but python is everywhere, and ruby isn't. All the applications that interest me are scriptable in python, not ruby. -- http://mail.python.org/mailman/listinfo/python-list
Re: *** Dr G Polya BRILLIANTLY analyses the Virgina Shooting Incident ***
On Apr 27, 12:59 pm, Fred Bloggs [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: On Apr 24, 2:09 pm, Quadibloc [EMAIL PROTECTED] wrote: The Real Andy wrote: Makes me wonder about the credibility of any statement Dr Gideon Polya makes. . I never thought that I would feel the urge to call someone an edelweiss-eating Tanzanian devil, but Dr. Polya proved that I lacked imagination. (Note that Tanzanian is pronounced Tan.zan._ee_.yan, not Tan._zayn_.ee.an; one wouldn't want to spoil the effect.) What really spoils the effect is that Dr. Polya lives in Tasmania, a state of Australia, and not in Tanzania, which is a country in East Africa. Semi-literate Americans do tend to confuse the two places, as they also tend confuse Australia and Austria. Oddly enough, edelweiss grows in Austria, so Dr. Polya would have to import it from Europe if he were in the habit of dining on edelweiss - which would be an eccentric habit, even in Austria, where the flower doesn't form part of the normal diet. -- Bill Sloman, Nijmegen Is there any civilized life in Tasmania? It looks like just another natural wonderland that was raped, pillaged, exploited for its resources, and left behind. The pillaging and rapine continues. The Green Party has managed to protect some of the more interesting elements of the ecology, but the paper mills where my father was research manager for as long as we lived in Tasmania continues to chop down a lot of trees. They liked to claim that their wood felling was sustainable, but since the cycle of felling and regrowth they had in mind at the time worked on a 200 year cycle, and the business was set up in the late 1930s, there wasn't a lot of farmed timber going into the wood chippers at the time. How it works at the moment isn't clear - two hundred year old wood isn't ideal for making paper. Even the official tourism site makes the place seem dull and bereft of any kind of enthusiasm, warning the prospective visitor that life is slow there. The population is only around 350,000 on an island the size of Ireland. The state has the highest fertility and the lowest rate of population growth of all the Australian states - anybody who is any good leaves, as I did, and pursues a career someplace where there are careers worth pursuing. I did not know Erol Flynn was from there. He was born there, but left Tasmania fairly early (like everybody else) - his father, the distinguished Australian marine biologist/ zoologist Prof. Theodore Thomson Flynn was presumably working at the University of Tasmania in Hobart in 1909. That's something anyway. They might consider making his boyhood home a museum or something. And was that Gunn Forestry you know so well. I don't know anything about Gunn Forestry. The Green Party obviously doesn't like it, but they do have a tendency to describe 25-year-old regrowth forests as virgin primeval rainforest because the lie plays better to their target audience than would the more nuanced truth. The paper mill where my father worked had to severely restrict the proportion of old-growth wood - trunks more than four feet (1,2 metres) in diameter - because the lignin in the older wood contained a relatively high proportion of some organic acid that messed up the caustic soda recovery cycle - and IIRR preferentially logged regrowth forests that had grown up in areas clear-felled after the first world war in order to provide cattle-raising farms for soldiers coming back from the First World War. The farms were not successful, and the land rapidly went back to forest. My father was the guy who worked out that a high proportion of old wood was what messed up the soda recovery process, and he hired the Norwegian chemist - Asbjorn Baklien - who worked out how the old wood caused the problem. Asbjorn went on to a brilliant career with ICI and Monash University. http://www.asap.unimelb.edu.au/bsparcs/biogs/P003354b.htm -- Bill Sloman, Nijmegen -- http://mail.python.org/mailman/listinfo/python-list
getting rid of EOL character ?
hello, In the previous language I used, when reading a line by readline, the EOL character was removed. Now I'm reading a text-file with CR+LF at the end of each line, Datafile = open(filename,'r') line = Datafile.readline() now this gives an extra empty line print line and what I expect that should be correct, remove CR+LF, gives me one character too much removed print line[,-2] while this gives what I need ??? print line[,-1] Is it correct that the 2 characters CR+LF are converted to 1 character ? Is there a more automatic way to remove the EOL from the string ? thanks, Stef Mientki -- http://mail.python.org/mailman/listinfo/python-list
Re: Multiple select in wx.GenericDirCrtl
On Apr 27, 7:31 am, Soren [EMAIL PROTECTED] wrote: Hi! Is it possible to do multiple file selections in a wx.GenericDirCtrl?? Thanks, Soren I'm not finding anything. I do know you can select multiple files using the FileDialog. You should email the wxPython users group though. They may have a custom control or they will likely be able to point you in the right direction. http://www.wxpython.org/maillist.php Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: getting rid of EOL character ?
stef wrote: hello, In the previous language I used, when reading a line by readline, the EOL character was removed. Now I'm reading a text-file with CR+LF at the end of each line, Datafile = open(filename,'r')line = Datafile.readline() now this gives an extra empty line print line and what I expect that should be correct, remove CR+LF, gives me one character too much removed print line[,-2] while this gives what I need ??? print line[,-1] Is it correct that the 2 characters CR+LF are converted to 1 character ? Is there a more automatic way to remove the EOL from the string ? line = line.rstrip(\r\n) should take care of it. If you leave out the parameter, it will strip out all whitespace at the end of the line, which is what I do in most cases. -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
Re: what python technology for my app?
Robert Rawlins - Think Blue a écrit : Just thought I'd make a little suggestion about this, I don’t know how strict you want to be with the web development side of things, but I'm a web developer by trade and have recently started using python for my non-web type applications. If you're looking for a web based server side solution, then you can't go wrong with Adobe ColdFusion. Err... is this a troll ? -- http://mail.python.org/mailman/listinfo/python-list
Re: what python technology for my app?
On Apr 27, 12:18 pm, Chris [EMAIL PROTECTED] wrote: I have an database containing lots of numerical data. I want to write a browser based interface that will allow selection of various key parameters and yield tables, plots and/or printouts of the data according to the selections. Ultimately I want this to run on an intranet so that others can get access via their browsers. The application is for in-house use only and not likely to have more than a few users at any one time. Any advice on what technologies I should be looking at for this? Python based naturally, and hopefully simple and lightweight. If I can throw something moderately functional together in a week or two (along with all the learning that entails) I'll be happy. btw - Platform needs to be windows because that's what on my desk. 1) for small intranet, 2) in Python, 3) dead simple, 4) runs on Windows - consider Karrigell: http://karrigell.sourceforge.net/en/front.htm Gerard -- http://mail.python.org/mailman/listinfo/python-list
visit http://www.real-article.com/spyware/index.php
The www.real-article.com website provides a ton of information about spyware. In addition, you will find extensive information on leading spyware to help you on your way to success. Please have a look at our spyware articles, products, resources, and additional information located throughout www.real-article.com. We strive to provide only quality articles, so if there is a specific topic related to spyware that you would like us to cover, please contact us at any time. visit http://www.real-article.com/spyware/index.php -- http://mail.python.org/mailman/listinfo/python-list
RE: what python technology for my app?
Haha, no Troll, just a shameless plug for my life's one true love ;-) Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bruno Desthuilliers Sent: 27 April 2007 14:35 To: python-list@python.org Subject: Re: what python technology for my app? Robert Rawlins - Think Blue a écrit : Just thought I'd make a little suggestion about this, I dont know how strict you want to be with the web development side of things, but I'm a web developer by trade and have recently started using python for my non-web type applications. If you're looking for a web based server side solution, then you can't go wrong with Adobe ColdFusion. Err... is this a troll ? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Generalized range
Beliavsky [EMAIL PROTECTED] wrote: ... I've taught numerical computing in university, and I would have had to fail anybody who'd misunderstood floating-point computations badly enough to try that +=step idea (including, sigh, the coders of several Fortran compilers who were popular at that time). You may be referring to the Fortran DO loop with a REAL loop variable, for example do x=1.5,3.5,0.5 print*,x end do This was part of standard Fortran 77, so one should blame the standards committee, not the compiler writers. Very few features of I was thinking of Fortran IV aka Fortran '66, where as I recall per the standard you were _supposed_ to only use integers in a DO, but several compilers supplied real loop variables as an extension, and got its implementation wrong. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: conditional print statement ?
or (untested): if Print_Info: def printOrNot(arg): print arg else: def printOrNot(arg): pass printOrNot(Datafile.readline()) thanks for the creative solution, and indeed it does work ;-) cheers, Stef Mientki -- http://mail.python.org/mailman/listinfo/python-list
Re: getting rid of EOL character ?
line = line.rstrip(\r\n) should take care of it. If you leave out the parameter, it will strip out all whitespace at the end of the line, which is what I do in most cases. thanks for the solution Michael, cheers, Stef -- http://mail.python.org/mailman/listinfo/python-list
Re: getting rid of EOL character ?
If you have a recent Python, see the documentation for open on the library page for built-in functions. http://docs.python.org/lib/built-in-funcs.html Jim -- http://mail.python.org/mailman/listinfo/python-list
Re: My python annoyances so far
[EMAIL PROTECTED] wrote: Well, I'd use ruby but python is everywhere, and ruby isn't. All the applications that interest me are scriptable in python, not ruby. Pity that you don't comment core topics. Regards, Björn -- BOFH excuse #289: Interference between the keyboard and the chair. -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
On Apr 27, 1:33 am, Paul McGuire [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, proctor [EMAIL PROTECTED] wrote:
hello,
i have a regex: rx_test = re.compile('/x([^x])*x/')
which is part of this test program:
import re
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
C:\testpython retest.py
['c']
can anyone point out why this is occurring? i can capture the entire
group by doing this:
rx_test = re.compile('/x([^x]+)*x/')
but why isn't the 'star' grabbing the whole group? and why isn't each
letter 'a', 'b', and 'c' present, either individually, or as a group
(group is expected)?
any clarification is appreciated!
sincerely,
proctor
As Josiah already pointed out, the * needs to be inside the grouping
parens.
Since re's do lookahead/backtracking, you can also write:
rx_test = re.compile('/x(.*?)x/')
The '?' is there to make sure the .* repetition stops at the first
occurrence of x/.
-- Paul
i am working through an example from the oreilly book mastering
regular expressions (2nd edition) by jeffrey friedl. my post was a
snippet from a regex to match C comments. every 'x' in the regex
represents a 'star' in actual usage, so that backslash escaping is not
needed in the example (on page 275). it looks like this:
===
/x([^x]|x+[^/x])*x+/
it is supposed to match '/x', the opening delimiter, then
(
either anything that is 'not x',
or,
'x' one or more times, 'not followed by a slash or an x'
) any number of times (the 'star')
followed finally by the closing delimiter.
===
this does not seem to work in python the way i understand it should
from the book, and i simplified the example in my first post to
concentrate on just one part of the alternation that i felt was not
acting as expected.
so my question remains, why doesn't the star quantifier seem to grab
all the data. isn't findall() intended to return all matches? i
would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match). why does it give only
one letter, and at that, the /last/ letter in the sequence??
thanks again for replying!
sincerely,
proctor
--
http://mail.python.org/mailman/listinfo/python-list
Re: conditional print statement ?
On Apr 26, 7:31 am, Dustan [EMAIL PROTECTED] wrote: On Apr 26, 1:58 am, Antoon Pardon [EMAIL PROTECTED] wrote: On 2007-04-25, Stef Mientki [EMAIL PROTECTED] wrote: hello, As part of a procedure I've a number sequences like this: Python if Print_Info: print Datafile.readline() else:Datafile.readline() /Python Is there a more compressed way to write such a statement, especially I dislike the redundancy Datafile.readline(). thanks, Stef Mientki You could consider the following def Print(arg): print arg def Noop(arg): pass or (untested): if Print_Info: def printOrNot(arg): print arg else: def printOrNot(arg): pass printOrNot(Datafile.readline()) (Print if Print_Info else Noop) (Datafile.readline()) -- Antoon Pardon- Hide quoted text - - Show quoted text -- Hide quoted text - - Show quoted text - The Enable/Disable decorators on the Python wiki (http:// wiki.python.org/moin/PythonDecoratorLibrary?highlight=%28decorator %29#head-8298dbf9ac7325d9ef15e7130e676378bbbda572) help you do something very similar, without having to replicate the function being enabled/disabled. @(disabled,enabled)[Print_Info] def printOrNot(arg): print arg -- Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
proctor wrote:
On Apr 27, 1:33 am, Paul McGuire [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, proctor [EMAIL PROTECTED] wrote:
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
As Josiah already pointed out, the * needs to be inside the grouping
parens.
so my question remains, why doesn't the star quantifier seem to grab
all the data.
Because you didn't use it *inside* the group, as has been said twice.
Let's take a simpler example:
import re
text = xabc
re_test1 = re.compile(x([^x])*)
re_test2 = re.compile(x([^x]*))
re_test1.match(text).groups()
('c',)
re_test2.match(text).groups()
('abc',)
There are three places that match ([^x]) in text. But each time you find
one you overwrite the previous example.
isn't findall() intended to return all matches?
It returns all matches of the WHOLE pattern, /x([^x])*x/. Since you used
a grouping parenthesis in there, it only returns one group from each
pattern.
Back to my example:
re_test1.findall(xabcxaaaxabc)
['c', 'a', 'c']
Here it finds multiple matches, but only because the x occurs multiple
times as well. In your example there is only one match.
i would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match).
You are essentially doing this:
group1 = a
group1 = b
group1 = c
After those three statements, you wouldn't expect group1 to be abc or
a. You'd expect it to be c.
--
Michael Hoffman
--
http://mail.python.org/mailman/listinfo/python-list
Re: regex question
proctor [EMAIL PROTECTED] wrote:
so my question remains, why doesn't the star quantifier seem to grab
all the data. isn't findall() intended to return all matches? i
would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match). why does it give only
one letter, and at that, the /last/ letter in the sequence??
findall returns the matched groups. You get one group for each
parenthesised sub-expression, and (the important bit) if a single
parenthesised expression matches more than once the group only contains
the last string which matched it.
Putting a star after a subexpression means that subexpression can match
zero or more times, but each time it only matches a single character
which is why your findall only returned the last character it matched.
You need to move the * inside the parentheses used to define the group,
then the group will match only once but will include everything that it
matched.
Consider:
re.findall('(.)', 'abc')
['a', 'b', 'c']
re.findall('(.)*', 'abc')
['c', '']
re.findall('(.*)', 'abc')
['abc', '']
The first pattern finds a single character which findall manages to
match 3 times.
The second pattern finds a group with a single character zero or more
times in the pattern, so the first time it matches each of a,b,c in turn
and returns the c, and then next time around we get an empty string when
group matched zero times.
In the third pattern we are looking for a group with any number of
characters in it. First time we get all of the string, then we get
another empty match.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Command-line option equiv of PYTHONPATH
On 2007-04-27, James Stroud [EMAIL PROTECTED] wrote: Rajesh wrote: Hi, The '-Ipath' option adds the path to the list of directories that contains modules that can be included in a script. I can use it as #!/ usr/bin/perl -Ipath_to_my_modules thereby not asking the user of the script to set the path_to_my_modules in their environment. Is there any equivalent command-line option to the python binary or a command-line version of PYTHONPATH? Regards Rajesh Why not just modify sys.path within the actual script? Maybe because he has multiple versions of modules he wants to test his script against. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: conditional print statement ?
Paul McGuire [EMAIL PROTECTED] wrote: The Enable/Disable decorators on the Python wiki (http:// wiki.python.org/moin/PythonDecoratorLibrary?highlight=%28decorator %29#head-8298dbf9ac7325d9ef15e7130e676378bbbda572) help you do something very similar, without having to replicate the function being enabled/disabled. @(disabled,enabled)[Print_Info] def printOrNot(arg): print arg Pardon me for asking, but isn't that a syntax error? Decorator syntax is: @ dotted_name [( [argument_list [,]] )] NEWLINE and you don't have a dotted_name. -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
On Apr 27, 9:10 am, proctor [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, Paul McGuire [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, proctor [EMAIL PROTECTED] wrote:
hello,
i have a regex: rx_test = re.compile('/x([^x])*x/')
which is part of this test program:
import re
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
C:\testpython retest.py
['c']
can anyone point out why this is occurring? i can capture the entire
group by doing this:
rx_test = re.compile('/x([^x]+)*x/')
but why isn't the 'star' grabbing the whole group? and why isn't each
letter 'a', 'b', and 'c' present, either individually, or as a group
(group is expected)?
any clarification is appreciated!
sincerely,
proctor
As Josiah already pointed out, the * needs to be inside the grouping
parens.
Since re's do lookahead/backtracking, you can also write:
rx_test = re.compile('/x(.*?)x/')
The '?' is there to make sure the .* repetition stops at the first
occurrence of x/.
-- Paul
i am working through an example from the oreilly book mastering
regular expressions (2nd edition) by jeffrey friedl. my post was a
snippet from a regex to match C comments. every 'x' in the regex
represents a 'star' in actual usage, so that backslash escaping is not
needed in the example (on page 275). it looks like this:
===
/x([^x]|x+[^/x])*x+/
it is supposed to match '/x', the opening delimiter, then
(
either anything that is 'not x',
or,
'x' one or more times, 'not followed by a slash or an x'
) any number of times (the 'star')
followed finally by the closing delimiter.
===
this does not seem to work in python the way i understand it should
from the book, and i simplified the example in my first post to
concentrate on just one part of the alternation that i felt was not
acting as expected.
so my question remains, why doesn't the star quantifier seem to grab
all the data. isn't findall() intended to return all matches? i
would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match). why does it give only
one letter, and at that, the /last/ letter in the sequence??
thanks again for replying!
sincerely,
proctor- Hide quoted text -
- Show quoted text -
Again, I'll repeat some earlier advice: you need to move the '*'
inside the parens - you are still leaving it outside. Also, get in
the habit of using raw literal notation (that is rslkjdfljf instead
of lsjdlfkjs) when defining re strings - you don't have backslash
issues yet, but you will as soon as you start putting real '*'
characters in your expression.
However, when I test this,
restr = r'/x(([^x]|x+[^/])*)x+/'
re_ = re.compile(restr)
print re_.findall(/xabxxcx/ /x123xxx/)
findall now starts to give a tuple for each comment,
[('abxxc', 'xxc'), ('123xx', 'xx')]
so you have gone beyond my limited re skill, and will need help from
someone else.
But I suggest you add some tests with multiple consecutive 'x'
characters in the middle of your comment, and multiple consecutive 'x'
characters before the trailing comment. In fact, from my
recollections of trying to implement this type of comment recognizer
by hand a long time ago in a job far, far away, test with both even
and odd numbers of 'x' characters.
-- Paul
--
http://mail.python.org/mailman/listinfo/python-list
Re: regex question
On Apr 27, 8:26 am, Michael Hoffman [EMAIL PROTECTED] wrote:
proctor wrote:
On Apr 27, 1:33 am, Paul McGuire [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, proctor [EMAIL PROTECTED] wrote:
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
As Josiah already pointed out, the * needs to be inside the grouping
parens.
so my question remains, why doesn't the star quantifier seem to grab
all the data.
Because you didn't use it *inside* the group, as has been said twice.
Let's take a simpler example:
import re
text = xabc
re_test1 = re.compile(x([^x])*)
re_test2 = re.compile(x([^x]*))
re_test1.match(text).groups()
('c',)
re_test2.match(text).groups()
('abc',)
There are three places that match ([^x]) in text. But each time you find
one you overwrite the previous example.
isn't findall() intended to return all matches?
It returns all matches of the WHOLE pattern, /x([^x])*x/. Since you used
a grouping parenthesis in there, it only returns one group from each
pattern.
Back to my example:
re_test1.findall(xabcxaaaxabc)
['c', 'a', 'c']
Here it finds multiple matches, but only because the x occurs multiple
times as well. In your example there is only one match.
i would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match).
You are essentially doing this:
group1 = a
group1 = b
group1 = c
After those three statements, you wouldn't expect group1 to be abc or
a. You'd expect it to be c.
--
Michael Hoffman
ok, thanks michael.
so i am now assuming that either the book's example assumes perl, and
perl is different from python in this regard, or, that the book's
example is faulty. i understand all the examples given since my
question, and i know what i need to do to make it work. i am raising
the question because the book says one thing, but the example is not
working for me. i am searching for the source of the discrepancy.
i will try to research the differences between perl's and python's
regex engines.
thanks again,
sincerely,
proctor
--
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Re: getting rid of EOL character ?
stef wrote: hello, In the previous language I used, when reading a line by readline, the EOL character was removed. Now I'm reading a text-file with CR+LF at the end of each line, Datafile = open(filename,'r') line = Datafile.readline() now this gives an extra empty line print line and what I expect that should be correct, remove CR+LF, gives me one character too much removed print line[,-2] while this gives what I need ??? print line[,-1] Is it correct that the 2 characters CR+LF are converted to 1 character ? Is there a more automatic way to remove the EOL from the string ? thanks, Stef Mientki abcd = 'abcdedff . \n' abcd 'abcdedff . \n' print abcd abcdedff . * from string import strip* print abcd.strip() abcdedff . a = abcd.strip() a 'abcdedff .' sph -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
On Apr 27, 8:37 am, Duncan Booth [EMAIL PROTECTED] wrote:
proctor [EMAIL PROTECTED] wrote:
so my question remains, why doesn't the star quantifier seem to grab
all the data. isn't findall() intended to return all matches? i
would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match). why does it give only
one letter, and at that, the /last/ letter in the sequence??
findall returns the matched groups. You get one group for each
parenthesised sub-expression, and (the important bit) if a single
parenthesised expression matches more than once the group only contains
the last string which matched it.
Putting a star after a subexpression means that subexpression can match
zero or more times, but each time it only matches a single character
which is why your findall only returned the last character it matched.
You need to move the * inside the parentheses used to define the group,
then the group will match only once but will include everything that it
matched.
Consider:
re.findall('(.)', 'abc')
['a', 'b', 'c']
re.findall('(.)*', 'abc')
['c', '']
re.findall('(.*)', 'abc')
['abc', '']
The first pattern finds a single character which findall manages to
match 3 times.
The second pattern finds a group with a single character zero or more
times in the pattern, so the first time it matches each of a,b,c in turn
and returns the c, and then next time around we get an empty string when
group matched zero times.
In the third pattern we are looking for a group with any number of
characters in it. First time we get all of the string, then we get
another empty match.
thank you this is interesting. in the second example, where does the
'nothingness' match, at the end? why does the regex 'run again' when
it has already matched everything? and if it reports an empty match
along with a non-empty match, why only the two?
sincerely,
proctor
--
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Re: My python annoyances so far
On 2007-04-27, Bruno Desthuilliers [EMAIL PROTECTED] wrote: 7stud a écrit : [EMAIL PROTECTED] wrote: Annoyances: Every language has annoyances. Python is no exception. Sure. But we may disagree on what are actually Python's annoyances !-) That is probably why the subject says: my annoyances -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I save command prompt screen
ozan SARI wrote:
Hi ,
I run a python acript with os.system('script.py')
I want save command prompt screen in a text file (everything )
how can I do this?
Thanks for your help
Ozan
check out using the subprocess module
http://docs.python.org/lib/node529.html subprocess%20module It seems
to be the new
replacement for os.system spawn, popen It has specific stdout,
stderr and stdin handling.
sph
--
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Accessing SQL View with Python
Hi All, I need to access a Microsoft SQL database View. Is there a way to do this with Python? I have done a fair share of googling and found nothing on accessing Views, just executing SQL, which I already know how to do. I am running Windows XP, Python 2.4. Thanks a lot! Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: Accessing SQL View with Python
[EMAIL PROTECTED] wrote: Hi All, I need to access a Microsoft SQL database View. Is there a way to do this with Python? I have done a fair share of googling and found nothing on accessing Views, just executing SQL, which I already know how to do. I am running Windows XP, Python 2.4. Absolutely loads of ways. But (unless I'm missing something here) they all involve executing SQL which accesses a View (such as: SELECT * FROM v_info). Have I missed the point of your question? TJG -- http://mail.python.org/mailman/listinfo/python-list
building _tkinter module with .NET 2005?
I have the Python 2.5.1 source and I'm trying to build the debug version of the _tkinter module. I've got .NET 2005 (Visual Studio 8) but the instructions in the pcbuild\readme.txt file only contain instructions for using .NET 2003 (Visual Studio 7.1). There's another readme.txt file under the pcbuild8 directory, but is almost identical to the one in the pcbuild folder. (There's some information about some new instrumented build settings, but that's about it) The instructions contained in both these readme.txt files say that the Tcl, Tk, and Tix projects must be built from the command line first, using nmake.exe in conjunction with the corresponding makefile.vc for each package. I can get this to work using .NET 2003, but not with .NET 2005. Is there an updated set of instructions somewhere for doing this with .NET 2005? Is it even possible to get it to work with the newer version of .NET? -- http://mail.python.org/mailman/listinfo/python-list
Re: Access to raw command line?
Yes, but I want to make it less difficult for my end users, not more difficult. I think the best is to require an extra switch for the photo files, as some of the people here suggested. On Apr 26, 6:27 pm, Grant Edwards [EMAIL PROTECTED] wrote: On 2007-04-26, Pieter Edelman [EMAIL PROTECTED] wrote: All your posts pretty much confirmed my own thoughts on this subject. Every option requires a specific action from the user, and as Bjoern points out, it would differ from what everybody is used to. I think there's no trivial and reliable way to do this, so I can better leave it the way it is (at least for now). Quoting things on the command line that you don't want the shell to expand is trivial and reliable. It's also something than any shell user should know. -- Grant Edwards grante Yow! I wonder if there's at anything GOOD on tonight? visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: conditional print statement ?
On Apr 27, 9:45 am, Duncan Booth [EMAIL PROTECTED] wrote: Paul McGuire [EMAIL PROTECTED] wrote: The Enable/Disable decorators on the Python wiki (http:// wiki.python.org/moin/PythonDecoratorLibrary?highlight=%28decorator %29#head-8298dbf9ac7325d9ef15e7130e676378bbbda572) help you do something very similar, without having to replicate the function being enabled/disabled. @(disabled,enabled)[Print_Info] def printOrNot(arg): print arg Pardon me for asking, but isn't that a syntax error? Decorator syntax is: @ dotted_name [( [argument_list [,]] )] NEWLINE and you don't have a dotted_name. My bad. The wiki example assigns the appropriate decorator to another name, and then uses that name, like this: debugFlag = int(False) state = (disabled,enabled)[debugFlag] # -- proper way to do this @state def debugPrint(s): print s print here comes some debug output debugPrint(xyzzy is the secret word) print that was it I think early in the decorator syntax discussions, there were some proposals that decorators could be expressions, but I guess I forgot which way that was decided. The example in this post does work (and so does the one on the wiki) . -- Paul -- http://mail.python.org/mailman/listinfo/python-list
My newbie annoyances so far
Python is not VB and Python is not Java and Python is not Ruby and Python is not any other language that is not Python. 1. Functions cannot be called without the parens (like in VB) 2. Python uses some naming conventions as programmer cues, such as leading and trailing double-underscores to indicate some form of specialness (I'm not overfond of relying on naming for this kind of information encoding either, but I got used to it) 3. Python does not use braces to demarcate executable blocks of code, or to define anonymous code blocks (like in Java, Ruby, or Smalltalk) 4. Python does not require every line of code to be enclosed within a class (like in Java or Smalltalk) 5. Python does not do compile-time type checking on function arguments or variable assignments (like in Java or C or C++) (yet... and will it still be Python when it does?) 6. Python does not have interfaces to enforce object type compatibility (like in Java) Just because Python has features that are different from those in your former language X does not mean it is deficient. Python *might* be deficient - ternary expressions are now part of the language after years of refugees from C and C++ asking how to write a = b ? c : d, and now they'll get to puzzle/gripe over mapping this to a = c if b else d. But as a newbie, you need to invest a little more time and effort and study and reflection (collectively called experience) before bandying about lists of personal gripes and reasons why Python is annoying/stupid/sucks. At least in public. Actually, it might be of value to keep your own personal list, and then revisit it a month or a year later and see if the warts are still as offending to your sensibilities as they originally were. Newbies, please try to work with Python as it is for a bit. Ask questions when the documentation is unclear to you or the results of your efforts confound you. But please hold of on the reasons Python sucks lists. You might find that these deficiencies actually translate into strengths. Despite its warts, Python is being used productively by at least several dozen people around the world, so it must be good for *something*. -- Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
proctor [EMAIL PROTECTED] wrote:
re.findall('(.)*', 'abc')
['c', '']
thank you this is interesting. in the second example, where does the
'nothingness' match, at the end? why does the regex 'run again' when
it has already matched everything? and if it reports an empty match
along with a non-empty match, why only the two?
There are 4 possible starting points for a regular expression to match in a
three character string. The regular expression would match at any starting
point so in theory you could find 4 possible matches in the string. In this
case they would be 'abc', 'bc', 'c', ''.
However findall won't get any overlapping matches, so there are only two
possible matches and it returns both of them: 'abc' and '' (or rather it
returns the matching group within the match so you only see the 'c'
although it matched 'abc'.
If you use a regex which doesn't match an empty string (e.g. '/x(.*?)x/'
then you won't get the empty match.
--
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Re: Access to raw command line?
Of course you're right about that. I think an optional GUI or wizard- like interface (in this particular case) would be best, but I was looking for an easy fix :) Thanks for the suggestion though. On Apr 26, 5:25 pm, Michele Simionato [EMAIL PROTECTED] wrote: On Apr 26, 9:04 am, Pieter Edelman [EMAIL PROTECTED] wrote: Hi, I'm currently writing a command-line program in Python, which takes commands in the form of: ./myprog.py [OPTIONS] ARGS Once you start having too many arguments and options on the command line, you might consider using the cmd module of the standard library instead. Then you could implement your own expansion, and you would have portability for non-Unix system too. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
use urllib library to have an upload status bar
Hi all, Before I start, please know that I'm no developer, just a user. This is also a cross-post as I have tried to post the same at python- bugs mailing list, just don't know if it gets in or not. We have a bug-reporting system in ubuntu called apport. Apparently apport uses a python library called urllib. As of now, apport does a bouncing bar while uploading which doesn't give the user idea as to how much is being uploaded. Refer https://bugs.launchpad.net/ubuntu/+source/apport/+bug/91521 . I did try to see if this issue has been addressed or not but came nowhere. It would be nice to know if there are some solutions, or is there a roadmap where this feature would be integrated in the library. Looking forward to suggestions, additions, flames constructive criticism of the same. Keep up the good work. Cheers! -- http://mail.python.org/mailman/listinfo/python-list
Re: regex question
On Apr 27, 8:50 am, Paul McGuire [EMAIL PROTECTED] wrote:
On Apr 27, 9:10 am, proctor [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, Paul McGuire [EMAIL PROTECTED] wrote:
On Apr 27, 1:33 am, proctor [EMAIL PROTECTED] wrote:
hello,
i have a regex: rx_test = re.compile('/x([^x])*x/')
which is part of this test program:
import re
rx_test = re.compile('/x([^x])*x/')
s = '/xabcx/'
if rx_test.findall(s):
print rx_test.findall(s)
i expect the output to be ['abc'] however it gives me only the last
single character in the group: ['c']
C:\testpython retest.py
['c']
can anyone point out why this is occurring? i can capture the entire
group by doing this:
rx_test = re.compile('/x([^x]+)*x/')
but why isn't the 'star' grabbing the whole group? and why isn't each
letter 'a', 'b', and 'c' present, either individually, or as a group
(group is expected)?
any clarification is appreciated!
sincerely,
proctor
As Josiah already pointed out, the * needs to be inside the grouping
parens.
Since re's do lookahead/backtracking, you can also write:
rx_test = re.compile('/x(.*?)x/')
The '?' is there to make sure the .* repetition stops at the first
occurrence of x/.
-- Paul
i am working through an example from the oreilly book mastering
regular expressions (2nd edition) by jeffrey friedl. my post was a
snippet from a regex to match C comments. every 'x' in the regex
represents a 'star' in actual usage, so that backslash escaping is not
needed in the example (on page 275). it looks like this:
===
/x([^x]|x+[^/x])*x+/
it is supposed to match '/x', the opening delimiter, then
(
either anything that is 'not x',
or,
'x' one or more times, 'not followed by a slash or an x'
) any number of times (the 'star')
followed finally by the closing delimiter.
===
this does not seem to work in python the way i understand it should
from the book, and i simplified the example in my first post to
concentrate on just one part of the alternation that i felt was not
acting as expected.
so my question remains, why doesn't the star quantifier seem to grab
all the data. isn't findall() intended to return all matches? i
would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match). why does it give only
one letter, and at that, the /last/ letter in the sequence??
thanks again for replying!
sincerely,
proctor- Hide quoted text -
- Show quoted text -
Again, I'll repeat some earlier advice: you need to move the '*'
inside the parens - you are still leaving it outside. Also, get in
the habit of using raw literal notation (that is rslkjdfljf instead
of lsjdlfkjs) when defining re strings - you don't have backslash
issues yet, but you will as soon as you start putting real '*'
characters in your expression.
However, when I test this,
restr = r'/x(([^x]|x+[^/])*)x+/'
re_ = re.compile(restr)
print re_.findall(/xabxxcx/ /x123xxx/)
findall now starts to give a tuple for each comment,
[('abxxc', 'xxc'), ('123xx', 'xx')]
so you have gone beyond my limited re skill, and will need help from
someone else.
But I suggest you add some tests with multiple consecutive 'x'
characters in the middle of your comment, and multiple consecutive 'x'
characters before the trailing comment. In fact, from my
recollections of trying to implement this type of comment recognizer
by hand a long time ago in a job far, far away, test with both even
and odd numbers of 'x' characters.
-- Paul
thanks paul,
the reason the regex now give tuples is that there are now 2 groups,
the inner and outer parens. so group 1 matches with the star, and
group 2 matches without the star.
sincerely,
proctor
--
http://mail.python.org/mailman/listinfo/python-list
editing scripts on a mac
I am teaching someone Python by email, and part of our conversation recently ran as follows: him How do I save a script and run it? me Do you have a text editor? If so, edit the script in that, then save it me in your home directory (the place you can see when you open the terminal him I do not have a text editor, but here are the answers to him questions 1-5. Now, frankly, I don't think this answer is correct, since I know OS X is a UNIX derivative, but I am loathe to involve a programming noob with vi or something similar. So I wondered if one of the c.l.py mac users could give brief instructions for firing up a visual text editor of some sort and saving a file somewhere it can easily be accessed from a terminal window (which I presume starts up in his home directory). regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Recent Ramblings http://holdenweb.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: My newbie annoyances so far
Paul McGuire wrote: Python is not VB and Python is not Java and Python is not Ruby and Python is not any other language that is not Python. As someone who's written in too many programming languages over a long career, I'm quite pleased with Python as a programming language. It's straightforward to write, has few irregularities, and has good run-time error semantics. The weak points in Python are implementation issues. Sockets, HTTP access, SSL, and database access are all flakier than they should be for such common capabilities. The CPython implementation is unreasonably slow compared to good implementations of other dynamic languages such as LISP and JavaScript. But really, the language is in good shape. I'd rather have a faster implementation of Python 2.5 than anything being proposed as a language change. John Nagle (P.S. PEP 3117 is a joke, right?) -- http://mail.python.org/mailman/listinfo/python-list
Learning to use wxPython
Hi, I downloaded the wxPython demo and did an emerge wxpython (gentoo) to install. When I run the demo, I am getting this error: # python demo.py Traceback (most recent call last): File /usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/ _misc.py, line 1286, in Notify self.notify() File /usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/ _core.py, line 13637, in Notify self.result = self.callable(*self.args, **self.kwargs) File /root/wxPython Demo/wxPython-2.8.3.0/demo/Main.py, line 1798, in ShowMain frame = wxPythonDemo(None, wxPython: (A Demonstration)) File /root/wxPython Demo/wxPython-2.8.3.0/demo/Main.py, line 1275, in __init__ self.filter = wx.SearchCtrl(leftPanel) AttributeError: 'module' object has no attribute 'SearchCtrl' What am I doing wrong? Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Accessing SQL View with Python
On Apr 27, 10:29 am, Tim Golden [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Hi All, I need to access a Microsoft SQL database View. Is there a way to do this with Python? I have done a fair share of googling and found nothing on accessing Views, just executing SQL, which I already know how to do. I am running Windows XP, Python 2.4. Absolutely loads of ways. But (unless I'm missing something here) they all involve executing SQL which accesses a View (such as: SELECT * FROM v_info). Have I missed the point of your question? TJG I figured there was. And yes, I knew you'd need to use SQL to get at the View. I just re-ran it and discovered that I am quite good at typos. I corrected the SQL and it seems to be working now. Thanks for the help. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: Learning to use wxPython
KDawg44 wrote: Hi, Hi, I downloaded the wxPython demo and did an emerge wxpython (gentoo) to install. When I run the demo, I am getting this error: # python demo.py Traceback (most recent call last): File /usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/ _misc.py, line 1286, in Notify From here, I read that you are using the wx version 2.6 and the demo that you are tring are for the 2.8.3! (the last as now). So: 1) install the new 2.8 2) download the demo for the 2.6! :) Bye, Michele -- http://mail.python.org/mailman/listinfo/python-list
Re: editing scripts on a mac
him I do not have a text editor, but here are the answers to him questions 1-5. Now, frankly, I don't think this answer is correct, since I know OS X is a UNIX derivative, but I am loathe to involve a programming noob with vi or something similar. So I wondered if one of the c.l.py mac users could give brief instructions for firing up a visual text editor of some sort and saving a file somewhere it can easily be accessed from a terminal window (which I presume starts up in his home directory). I think emacs is bundled with OS X and can be started in a terminal window with emacs. If you want a non-terminal editor Aquaemacs (http://aquamacs.org/) is available and easily installed on mac. Cheers Tommy -- http://mail.python.org/mailman/listinfo/python-list
Re: My newbie annoyances so far
John Nagle wrote: (P.S. PEP 3117 is a joke, right?) Note date of creation. -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
Re: editing scripts on a mac
On Apr 27, 11:37 am, Tommy Grav [EMAIL PROTECTED] wrote: him I do not have a text editor, but here are the answers to him questions 1-5. Now, frankly, I don't think this answer is correct, since I know OS X is a UNIX derivative, but I am loathe to involve a programming noob with vi or something similar. So I wondered if one of the c.l.py mac users could give brief instructions for firing up a visual text editor of some sort and saving a file somewhere it can easily be accessed from a terminal window (which I presume starts up in his home directory). 1) Open Finder, click Applications, and open TextEdit. 2) hit shift-apple-T, or select Format - Make Plain Text, to put you in plaintext mode (It's .rtf by default) 3) Make sure you save in the home directory (usually a picture of a house). HTH, Tom -- http://mail.python.org/mailman/listinfo/python-list
Re: editing scripts on a mac
On 27 apr 2007, at 18.08, Steve Holden wrote: I am teaching someone Python by email, and part of our conversation recently ran as follows: him How do I save a script and run it? me Do you have a text editor? If so, edit the script in that, then save it me in your home directory (the place you can see when you open the terminal him I do not have a text editor, but here are the answers to him questions 1-5. Now, frankly, I don't think this answer is correct, since I know OS X is a UNIX derivative, but I am loathe to involve a programming noob with vi or something similar. So I wondered if one of the c.l.py mac users could give brief instructions for firing up a visual text editor of some sort and saving a file somewhere it can easily be accessed from a terminal window (which I presume starts up in his home directory). regards Steve Text Wrangler (www.barebones.com) and Alpha/Tk are both excellent GUI programmers editors that run on Mac. Alpha/Tk is open-sourced as well -- What is a woman that you forsake her, and the hearth fire and the home acre, to go with the old grey Widow Maker. --Kipling, harp song of the Dane women Tommy Nordgren [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: use urllib library to have an upload status bar
shirish wrote: Hi all, Before I start, please know that I'm no developer, just a user. This is also a cross-post as I have tried to post the same at python- bugs mailing list, just don't know if it gets in or not. We have a bug-reporting system in ubuntu called apport. Apparently apport uses a python library called urllib. As of now, apport does a bouncing bar while uploading which doesn't give the user idea as to how much is being uploaded. Refer https://bugs.launchpad.net/ubuntu/+source/apport/+bug/91521 . I did try to see if this issue has been addressed or not but came nowhere. It would be nice to know if there are some solutions, or is there a roadmap where this feature would be integrated in the library. Looking forward to suggestions, additions, flames constructive criticism of the same. Keep up the good work. Cheers! the generic http browser upload doesn't give you any opportunity to have a callback so you can update the screen with any progress. There are some Java solutions available, but IMHO it will take a major change to browser's http upload implementation to make this possible. -Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: Correct behavior?
[EMAIL PROTECTED] wrote: On Apr 26, 8:34 pm, asker [EMAIL PROTECTED] wrote: But: print %15.2f % a+b Traceback (most recent call last): File stdin, line 1, in module TypeError: cannot concatenate 'str' and 'float' objects Is this correct for Python to issue this error? The % operator has higher precedence than +. Thus, %15.2f % a+b == (%15.2f % a)+b, an illegal str+float addition. Just as a warning: If you're not expecting this behavior, you can get a pretty nasty surprise if the adddition in question is str+str and the operation becomes legal (but semantically different): s1 = Captain s2 = Bertorelli print Ah, %s! Welcome to my humble cafe... % s1+s2 -- Ah, Captain ! Welcome to my humble cafe...Bertorelli Of course this can (and should) be avoided using ...%s%s... % (s1,s2), but I know it has bitten me once. -- http://mail.python.org/mailman/listinfo/python-list
Re: Rational numbers
On 2007-02-23 16:35, Martin Manns wrote: Hi, I am starting to use rationals and since I found no batteries included, I tried out the mxNumber package. However, I get strange warnings on comparison operations (which however seem to yield correct results): --- $ python Python 2.4.3 (#1, Jan 15 2007, 15:46:19) [GCC 4.1.1 (Gentoo 4.1.1-r3)] on linux2 Type help, copyright, credits or license for more information. from mx.Number import * a=Rational(0,1) a 0/1 str(a) '0.0' b=-50 b -50L a==b __main__:1: RuntimeWarning: tp_compare didn't return -1, 0 or 1 False --- How do I get rid of these warnings? FYI: The next version of mxNumber will have this warning removed. Is there any rational number library around that 1) is comparably fast for large denominators 2) allows deriving types from Rationals without wrapping? Regards Martin P.S. The respective mailing list does not like me, so that I try my luck here. Why is that ? The egenix-user mailing is open for all our users. We do require registration to stop spam from reaching the list. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Apr 27 2007) Python/Zope Consulting and Support ...http://www.egenix.com/ mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/ Try mxODBC.Zope.DA for Windows,Linux,Solaris,MacOSX for free ! eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 -- http://mail.python.org/mailman/listinfo/python-list
Re: My newbie annoyances so far
Dennis Lee Bieber wrote: On 27 Apr 2007 08:34:42 -0700, Paul McGuire [EMAIL PROTECTED] declaimed the following in comp.lang.python: deficient - ternary expressions are now part of the language after years of refugees from C and C++ asking how to write a = b ? c : d, and now they'll get to puzzle/gripe over mapping this to a = c if b else d. But as a newbie, you need to invest a little more time and And I'll probably ignore those expressions whenever I do get around to 2.5+... That syntax, in my mind, just... stinks... ALGOL used expression IF; you could write x := (IF a b THEN a ELSE b); but that doesn't map well to an indentation-based language. A syntax suitable for Python, now that there's a bool type, might be to define .if() for bool. Then one could write (a b).if(a,b) which is better than adding an operator. Such things are useful in formatting expressions. msg = 'Unit is %s' % (unitstatus.if(on,off),) but not really essential. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: http pipelining
[EMAIL PROTECTED] wrote: Which python module is capable of pipelining http requests? (I know httplib can send mulitple requests per tcp connection, but in a strictly serial way. ) Oops, sorry, you meant sending requests in parallel, right? You'll need to use either urllib or urllib2 for the web, and the threading module is one way to run parallel requests. It's fairly easy to use as long as you keep your tasks properly isolated form each other. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Recent Ramblings http://holdenweb.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: http pipelining
[EMAIL PROTECTED] wrote: Which python module is capable of pipelining http requests? (I know httplib can send mulitple requests per tcp connection, but in a strictly serial way. ) There's nothing in the standard library, I believe, that includes both client and server functionality in the same module. So you would need to glue them together. If you want a simple net proxy server I seem to remember the chameleon system allows you to write one in about twelve lines. If it has to be HTTP-specific, with header parsing and the like, you might want to think about Twisted, which supports both client and server functionality and tries to make it easy to plumb things together in pipelines. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Recent Ramblings http://holdenweb.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Learning to use wxPython
On Apr 27, 11:25 am, Michele Petrazzo [EMAIL PROTECTED] wrote: KDawg44 wrote: Hi, Hi, I downloaded the wxPython demo and did an emerge wxpython (gentoo) to install. When I run the demo, I am getting this error: # python demo.py Traceback (most recent call last): File /usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/ _misc.py, line 1286, in Notify From here, I read that you are using the wx version 2.6 and the demo that you are tring are for the 2.8.3! (the last as now). So: 1) install the new 2.8 2) download the demo for the 2.6! :) Bye, Michele ahhhmy badi did not realize that. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
