Bangalore Python February Meetup
Hi Swaroop, I do business development for a technology start up based in Hyderabad. We use Python and related technologies extensively, which means we are constantly on the lookout for partners and high quality talent. We are currently focussed on developing a series of ideas for Web 2.0 based services and we are very excited about the future. I am based in Bangalore and would love to attend one of meetings to try and connect with the community that you have created here. Do let me know where and when you have your meetings. Regards Ajay Business Development Azri Solutions Pvt Ltd +91-98867-18452 +91-40-2354-3940 Skype: ajay_s_1407 www.azri.biz -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
First Texas Unconference
I'm pleased to announce we in Houston have started planning the 1st Annual Texas Unconference for Python users. This is a FREE weekend event scheduled for Sept. 15-16, 2007. We've arranged use of the Texas Learning Computing Center on the campus of the University of Houston. Python users in the region are invited to attend and make this first event memorable! Visit our Wiki site and help shape the event over the next five months. http://pycamp.python.org/Texas/HomePage -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
How to communicate via USB port
Can someone explain how I would read the data from the USB port? I don't know if it matters, but I am trying to read the data from a GPS plugged in to the USB port. Thank you, Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: Future Python Gui?
kirkjobsluder wrote: I'd say that the best bet is to learn swig and similar bridging, expanding, and embedding mechanisms. For GUI programming this would seem overkill. Pick a GUI toolkit and it's almost guaranteed to be wrapped for use in Python already. Richard -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
On Wed, 18 Apr 2007 15:39:22 +1000, Steven D'Aprano wrote: I thought that an iterator was any object that follows the iterator protocol, that is, it has a next() method and an __iter__() method. ... class Parrot(object): ... def __init__(self): self.next = self._next() self.next isn't a method here, it's a generator. You could do: def __init__(self): self.next = self._next().next But, having tested, that doesn't appear to work either - I think this is because, again, self.next is not strictly a method, it's an attribute that happens to be callable. The python manual gives you a possible solution: ---QUOTE http://docs.python.org/lib/typeiter.html --- Python's generators provide a convenient way to implement the iterator protocol. If a container object's __iter__() method is implemented as a generator, it will automatically return an iterator object (technically, a generator object) supplying the __iter__() and next() methods. ---END QUOTE--- i.e., just rename your _next function to __iter__ . Your class won't itself be an iterator, but it will be usable in for statements and so one, and convertable to an iterator with the iter builtin. -- http://mail.python.org/mailman/listinfo/python-list
Re: Binary file output using python
Chi Yin Cheung wrote: Is there a way in python to output binary files? I need to python to write out a stream of 5 million floating point numbers, separated by some separator, but it seems that all python supports natively is string information output, which is extremely space inefficient. I'd tried using the pickle module, but it crashed whenever I tried using it due to the large amount of data involved. A minimalistic alternative is array.tofile()/fromfile(), but pickle should handle a list, say, of 5 million floating point numbers just fine. What exactly are you doing to provoke a crash, and what does it look like? Please give minimal code and the traceback. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: is laziness a programer's virtue?
Xah Lee wrote: Dear Ken, I want to thank you for your spirit in supporting and leading the lisp community, in spreading lisp the language both in what you have done technically as well as evangelization, as well as the love and knowledge attitude towards newsgroup communities in general, in part thru your numerous replies to my posts in the past years. Hey, thx, but to me recommending Lisp is like recommending water to a life form. Meanwhile, the last thing anyone can doubt is that you say what you mean and mean what you say, so all we can say about your detractors is... (as opposed to, the motherfucking pack of driveling and fuckface ignoramuses that are predominate personalities in newsgroups, ...OK, but we know this from long Usenet experience. Reaching Enlightenment means smiling on these noisemakers and having compassion for them, for they live in mean, narrow worlds and in attacking you are only reaching for the sunlight you enjoy, in however their ignorant way. The nice thing about this compassionate view is that it leaves you feeling positive and at peace within yourself, whereas the driveling and fuckface thing leaves you feeling negative and attacked. less good, for my money. ken -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
Steven D'Aprano [EMAIL PROTECTED] writes: class Parrot(object): def __iter__(self): return self def __init__(self): self.next = self._next() def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word Clearly the problem is you've misused an apostrophe. Python doesn't like the plural getting an apostrophe. URL:http://www.angryflower.com/bobsqu.gif -- \ Speech is conveniently located midway between thought and | `\ action, where it often substitutes for both. -- John Andrew | _o__) Holmes, _Wisdom in Small Doses_ | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Strange terminal behavior after quitting Tkinter application
Hi, I'm puzzled by some strange behavior when my Python/Tkinter application quits (on linux): the terminal from which I started Python is messed up. If start up python, then import the code below, then start the program with Application(), then click the Quit button, my terminal never prints anything again (such as commands I type). code import Tkinter import sys class Application(Tkinter.Tk): def __init__(self,**config): Tkinter.Tk.__init__(self,**config) Tkinter.Button(self,text=Quit,command=self.quit_application).pack() def quit_application(self): sys.exit() /code Can anyone tell me what I'm doing wrong? Thanks for your help. Chris -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange terminal behavior after quitting Tkinter application
(I'm not sure what happened to the formatting in my post: the Tkinter.Button line should be at the same level of indentation as the Tkinter.Tk.__init__ line.) -- http://mail.python.org/mailman/listinfo/python-list
Win32com, and Excel issues.
Hi all, I'm doing some Excel automation work for a friend, and am developing on a machine running Office 2000. My friends machine is running Excel 2003. The code I've written works like a charm on my machine (in fact all three of my machines), but falls over early on on Excel 2003. The code snippet it falls over on is code to copy one worksheet after another: app = wincl.Dispatch(Excel.Application) app.Visible = True app.Workbooks.Open(self.filename) sheet = app.Worksheets(1) sheet.Copy(None, sheet) and this last line throws the following exception: pywintypes.com_error: (-2147417851, 'the server threw an exception.' , None, None) which isn't too helpful. I'm wondering if something has changed in the Excel API that doesn't allow a null parameter to Copy or some similar issue. I tried using the keyword argument format, but that simply refused to work. Other relevant information: * The program is packaged using py2exe, so I know that the same version of Python, and the same libraries are on each machine. * One of the test machines running Excel 2000 does not have Python installed. * The machines are all of a similar spec. Any ideas are welcome! -- http://mail.python.org/mailman/listinfo/python-list
Re: ??? POLICE AND CITY/UNIVERSITY OFFICIALS INCOMPETENCE LEADS TO 33 KILLED BY KOREAN-ALQAEDA TERRORIST ???
On Apr 17, 12:18 pm, utabintarbo [EMAIL PROTECTED] wrote: On Apr 17, 10:32 am, Muhammad [EMAIL PROTECTED] wrote: On Apr 17, 7:56 am, [EMAIL PROTECTED] wrote: - snipped rant You mentioned Korean Al-Qaeda Terrorist in the title! Honesty demands that you establish it as a fact that the person was connected to Al-Qaeda and that he was a terrorist and not some mentally sick fellow. Muhammad Just do it in a more appropriate forum, mmmkay? Sorry about that. But I only post when I feel it necessary. And I thought that if I let this person be, it might get to: But Al-Qaeda is a Muslim terrorist organization, let us go get Muslims. Precisely like Wafa Sultan and Co. who want to eradicate Radical Islam for a start, but end up saying There is no moderate Muslim. In other words, Get all the Muslims. Not that it frightens me, I have seen much worse, but it is a bother. Muhammad -- http://mail.python.org/mailman/listinfo/python-list
Signals
Hello Chaps,
I posted about this the other day but I'm still struggling to get any form
of result from it. Basically I have the following piece of code, and
according to its API is produces singals when particular events occur, but i
have no idea how to list for events, I've tried all sorts of combinations
using the signal module but haven't been able to get it working.
#!/usr/bin/python
import dbus, signal
bus = dbus.SystemBus()
obj = bus.get_object('org.bluez', '/org/bluez')
obj = bus.get_object('org.bluez', '/org/bluez/hci0')
adapter = dbus.Interface(obj, 'org.bluez.Adapter')
adapter.DiscoverDevices()
Now here is a copy of the API documentation that lists the signals thrown by
the API, this is the one I'm trying to listen for.
void RemoteDeviceFound(string address, uint32 class, int16 rssi)
This signal will be send every time an inquiry result
has been found by the service daemon. In general they
only appear during a device discovery.
Basically I'm just looking to run a function that will print those details
to screen. Can anyone help with working out how to listen for this signal?
I'd also like to know how i can keep the application running until I decided
to stop it manually, as the DiscoverDevices() can take a while to complete
and send out several RemoteDeviceFound() signals in that period.
Thanks guys
Rob
--
http://mail.python.org/mailman/listinfo/python-list
Re: Queue enhancement suggestion
On 2007-04-17, Jean-Paul Calderone [EMAIL PROTECTED] wrote: On 17 Apr 2007 14:32:01 GMT, Antoon Pardon [EMAIL PROTECTED] wrote: On 2007-04-17, Jean-Paul Calderone [EMAIL PROTECTED] wrote: On 17 Apr 2007 13:32:52 GMT, Antoon Pardon [EMAIL PROTECTED] wrote: On 2007-04-17, Hendrik van Rooyen [EMAIL PROTECTED] wrote: [snip] Not sure I understand this - it sounds vaguely incestous to me. I normally use a GUI with two queues, one for input, one for output, to two threads that front end two named pipes to the next process - I try to avoid more than one thing reading or writing to one end of a queue or a pipe, so the dataflow diagram for my stuff always looks like a TinkerToy... The problem is that sometimes the gui thread has something to show too. With the added problem that the code wanting to show something doesn't know when it is executing the gui thread or an other. So it is very difficult to avoid the gui thread putting things on the queue. But since the gui thread is the single reader, it will dead lock if the queue happens to be full at the moment the gui thread want to add another item. This is pretty easily solved: def sendToGUI(event): if isInGUIThread(): gui.scheduleCall(event) else: guiQueue.put(event) No that is not a solution for the simple reason that now things can be shown out of order. Suppose I have a thread that shows the value of a certain variable. Now I have a button that can stop this thread and zero the variable. If I go for your solution a value may still be in the queue and my window ends up showing this last value instead of zero. Addressing that is up to the application code. Threading is tough, there are no magic bullets. The above is a very standard tool for addressing the concern raised earlier in this thread. It's only *part* of a solution though, the rest of the application has to play along. My solution is a more complete implementation of Queues, which allow a thread to register as reader, writer or reader-writer. Reader-writers are always allowed to put an element in the queue even if it is full. Since the Reader-writer will typically only put things on the queue as a result of user interaction, the queue wont grow too large anyway. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: Queue enhancement suggestion
On 2007-04-18, Hendrik van Rooyen [EMAIL PROTECTED] wrote: Antoon Pardon [EMAIL PROTECTED] wrote: The problem is that sometimes the gui thread has something to show too. With the added problem that the code wanting to show something doesn't know when it is executing the gui thread or an other. So it is very difficult to avoid the gui thread putting things on the queue. But since the gui thread is the single reader, it will dead lock if the queue happens to be full at the moment the gui thread want to add another item. This can happen - I suppose the cure is to have the GUI use a non blocking put in a try except checking for the full condition - its bad to block the GUI anyway because then the mouse and kbd become unresponsive. So even the reads (get) have to be non blocking, or the thing will behave like a disobedient dog, that knows what to do, but just refuses. My queue module has a register call. So you can register it to GTK the same way you can register a pipe or network connection. So the gui will only try to get things from the queue if there is something in it. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
on 18.04.2007 07:39 Steven D'Aprano said the following: I thought that an iterator was any object that follows the iterator replace object with instance of a class, i.e. the relevant methods are looked up in the __class__ not in the instance (I think). I had the same troubles trying to dynamically reassign a __call__ method... protocol, that is, it has a next() method and an __iter__() method. But I'm having problems writing a class that acts as an iterator. I have: class Parrot(object): def __iter__(self): return self def __init__(self): self.next = self._next() def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word Try this:: class Parrot(object): def __iter__(self): return self def __init__(self): self.__class__.next = self._next().next # see post by I V def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word This works but practically forces the class to be used as a singleton... not very helpful :) Better: * use the '__iter__ returns/is a generator' way, * or if you need the object to be the iterator, implement the next method directly on the class:: class Parrot(object): def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word def __iter__(self): self.generator = self._next() return self def next(self): return self.generator.next() cheers, stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: The smallest and largest values of numeric types
Michael Hoffman [EMAIL PROTECTED] wrote: 20859248300531693115643211913059311997417115606882000504639505780471641693377296 50765802242049L Of course performance decreases for longer longs. I once made a thing that tried to find the limit of longs and stopped when I had two or three screenfulls of numbers. I came to the conclusion that for integer arithmetic like this, the limit is either your memory size, or some other number that is so big that in practice you don't have to worry about it.. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Screen Control in WinXP and Linux
peter wrote: I've been wrestling on and off with this problem for over a year now, without success. Basically, I am looking for a simple set of screen and keyboard manipulation commands that will run identically under Linux and Windows. Nothing fancy - just clear the screen, print a string at an arbitrary xy position and detect a keystroke. I've googled around this newsgroup and elsewhere, and come across various suggestions (and even posted my own partial solutions), but still haven't come up with an elegant solution. OK, a bit of info from the Windows side of things. Here are several existing modules which offer the kind of thing you're after in different ways. Don't bother with the ANSI thing; it's a dead end under Windows. http://newcenturycomputers.net/projects/wconio.html http://effbot.org/zone/console-index.htm http://adamv.com/dev/python/curses/ I've used the first two for relatively trivial things, the third not at all. The third is interesting, obviously, because curses is readily available on Linux (indeed comes as part of Python, I think). So that might be a quick win. Alternatively, and depending on your needs, there are a few UI addons for pygame: http://www.pygame.org/projects/9 Might not be what you're after from your original description, but better too much information than too little. Obviously, unless the curses stuff fits your needs, you might need to write a wrapper module doing a bit of conditional importing or platform-sniffing, but that's not beyond the wit of man. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: The smallest and largest values of numeric types
On Wed, 18 Apr 2007 07:15:11 +0200, Hendrik van Rooyen wrote: I once made a thing that tried to find the limit of longs and stopped when I had two or three screenfulls of numbers. You should find that converting longs to strings (say, for printing them) is *very* slow. E.g. the following code big = 10L**100 # one google, a big number while True: print big # so we can see the last value before it fails big *= 10 will run terribly slow and should be written as: big = 10L**100 # one google, a big number try: while True: big *= 10 except: # don't know what exception will be raised, so catch ANYTHING print len(str(big))-1 # the number of digits only does the slow conversion to string once, instead of every time around the loop. However, once your machine starts paging, it will still slow down a lot. I came to the conclusion that for integer arithmetic like this, the limit is either your memory size, or some other number that is so big that in practice you don't have to worry about it.. Yes, longs are limited only by the amount of memory accessible. -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
On Wed, 18 Apr 2007 16:58:23 +1000, Ben Finney wrote: Steven D'Aprano [EMAIL PROTECTED] writes: class Parrot(object): def __iter__(self): return self def __init__(self): self.next = self._next() def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word Clearly the problem is you've misused an apostrophe. Python doesn't like the plural getting an apostrophe. URL:http://www.angryflower.com/bobsqu.gif I thought the rule wa's that any time you 'see an 'S, you put an apo'strophe before it. If that's wrong, 'shouldn't it rai'se an exception? -- 'Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
On Wed, 18 Apr 2007 06:13:39 +, I V wrote: On Wed, 18 Apr 2007 15:39:22 +1000, Steven D'Aprano wrote: I thought that an iterator was any object that follows the iterator protocol, that is, it has a next() method and an __iter__() method. [snip] i.e., just rename your _next function to __iter__ . Your class won't itself be an iterator, but it will be usable in for statements and so one, and convertable to an iterator with the iter builtin. Thanks to all those who helped, this fixed my problem. For the record, this is what I actually wanted: a four-line self-sorting dictionary: class SortedDict(dict): def __iter__(self): for key in sorted(self.keys()): yield key Note that using sorted(self) does not work. Iterating over a SortedDictionary returns the keys in sorted order. This minimalist implementation doesn't sort the values, items or string representation of the dict, but they should be easy to implement. -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange terminal behavior after quitting Tkinter application
On Apr 18, 2007, at 2:33 AM, Chris wrote: I'm puzzled by some strange behavior when my Python/Tkinter application quits (on linux): the terminal from which I started Python is messed up. If start up python, then import the code below, then start the program with Application(), then click the Quit button, my terminal never prints anything again (such as commands I type). code import Tkinter import sys class Application(Tkinter.Tk): def __init__(self,**config): Tkinter.Tk.__init__(self,**config) Tkinter.Button(self,text=Quit,command=self.quit_application).pack() def quit_application(self): sys.exit() /code Can anyone tell me what I'm doing wrong? What happens if you type 'stty sane' (and of course, a carriage return) afterwards? -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting started with python
On Apr 17, 11:00 pm, Basilisk96 [EMAIL PROTECTED] wrote: On Apr 14, 8:46 pm, Eric [EMAIL PROTECTED] wrote: Hello, after reading some of the book Programming Python it seems that python is something I would like to delve deeper into. The only thing is, I have no idea what I should try and write. So I was hoping that someone here could help point me to a group/project that would be a good starting place for a person with limited python knowledge, but that is willing to learn whatever is necessary. I'm hoping that with a goal I can start to learn python instead of just playing around with it. Thanks. Eric, You will certainly appreciate how concise and easy Python is. I am also relatively new to Python (started about a year ago), and I'd rather not go back to any other language! Why would I want to torment my not-so-quick typing fingers?? :) I'm a self-learner. I learn by reading, by example, and by doing. Here is a list of suggestions. Start with simple things, grow confident, and move on to more interesting stuff as you progress: At the Python command line, type import this to see the basic ideas behind Python development. It begins with Beautiful is better than ugly. - a nice thought. 1. First of all, read the publication How to Think Like a Computer Scientist: Learning with Python by Allen B. Downey et al. I have found this little gem to be very, very useful when I first got interested in Python and thought to myself, how do I go about learning this, where do I start??. Highly recommended. I read it from start to finish in a couple of days and started making useful scripts right after that. The author actually implements a simple card game toward the end of the book, using all the knowledge from the previous chapters. The text is available at:http://www.ibiblio.org/obp/thinkCSpy/ 2. Play with Python from the command line first, using PyShell, PyCrust, or any of its other siblings that come with the wxPython package (a GUI toolkit - see #8 below). You will find the code completion feature and the syntax helper quite useful. 3. Tinker around with the builtin modules. There's a lot of built-in functionality in Python right out of the box. Try the os and sys modules to experiment with filesystem handling. Try reading and writing text files, as this is quite a common task with a variety of applications. Try the struct module for binary file processing. Try the urllib and urllib2 modules for loading and processing Web pages... I could go on, but you get the idea. 4. If you have a text processing background, dip your hand in regular expressions with the re module. Maybe you have a need for extracting some statistical data from a financial report, and this might be one way to do it. 5. If you have a mathematical background, download and install the NumPy or SciPy package and do some wild matrix math! 6. I have recently tinkered with the Pymedia package, perhaps you want to try it later on. It is a nice tool for dealing with audio - for recording, encoding, decoding, spectrum analysis, etc. In just a few hours, I came up with a nice voice-activated MP3 sound recorder application. 7. If you feel brave and want to work with Windows COM client/server stuff (assuming Windows is your platform), get the PythonWin package, also known as win32com and try to read/write Excel, Word files, etc., or whatever 8. Last but certainly not least, once you feel comfortable with basic Python, try GUI development. Several gui toolkits are out there. wxPython is a good one to start with, though you may find some others to your liking. 9. If you have previous programming experience, try taking an application you've developed before and port it to Python. See how much your code base shrinks compared to its C++ or Java counterpart :) But really, do it just to understand Python on a deeper level. Instead of thinking in the old way, try to think in the Pythonic way. A nice example of this is iteration. Where an iteration counter variable is required in most other languages, Python inherently supports iteration in sequence objects like lists, strings, and dictionary keys; so the syntax is simpler in most cases. -Basilisk96 I choose python with a goal in mind the language was not important.. Python is fantastic for input and output.. Once in a while I get stuck and to be honest if I had a little more cash I would be putting a small project on rent a coder that said tracker software where the notes are defined in collums are great for practicing input output, I can always do that myself but if there is a interest (or if a intresting idea presents itself because small projects can be linked) then I am game... good luck to all of you and happy learning -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
On Apr 18, 3:32 am, Steven D'Aprano [EMAIL PROTECTED] wrote: On Wed, 18 Apr 2007 06:13:39 +, I V wrote: On Wed, 18 Apr 2007 15:39:22 +1000, Steven D'Aprano wrote: I thought that an iterator was any object that follows the iterator protocol, that is, it has a next() method and an __iter__() method. [snip] i.e., just rename your _next function to __iter__ . Your class won't itself be an iterator, but it will be usable in for statements and so one, and convertable to an iterator with the iter builtin. Thanks to all those who helped, this fixed my problem. For the record, this is what I actually wanted: a four-line self-sorting dictionary: class SortedDict(dict): def __iter__(self): for key in sorted(self.keys()): yield key Note that using sorted(self) does not work. Iterating over a SortedDictionary returns the keys in sorted order. This minimalist implementation doesn't sort the values, items or string representation of the dict, but they should be easy to implement. -- Steven D'Aprano Very neat. Why not this? class SortedDict(dict): def __iter__(self): return iter(sorted(self.keys())) -- Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange terminal behavior after quitting Tkinter application
What happens if you type 'stty sane' (and of course, a carriage return) afterwards? The terminal returns to normal, thanks! But does anyone know why the Tkinter program is doing this to the terminal in the first place? I don't want to have to tell users of my program that they must recover their terminal's sanity each time after running my program. -- http://mail.python.org/mailman/listinfo/python-list
exception just to avoid output error (newbie)
Hi
I'm trying to delete some files, but i get an exception error if the
file don't exist.
I can use an {if fileexist(file) then delete}, but it will get cpu
time.
So i catch the exception with:
try: os.remove(filename)
except EnvironmentError: error=1
If i just want to avoid the output error, is this the right way to
write the code?
I don't care of get if is in error, but an except EvironmetError
without the : will give me a sytax error.
Am I too much complicated? :-)
Thanks in advance
--
http://mail.python.org/mailman/listinfo/python-list
Re: is laziness a programer's virtue?
On 18 Apr., 01:54, Lew [EMAIL PROTECTED] wrote: Markus E Leypold Trying to correct Xah's behaviour is probably impossible. Ingo Menger wrote: Perhaps somebody could ask the chinese government to put him in jail for hurting international society :) Y'know, even in jest, calling for an oppressive regime to suppress even wrong-headed and self-serving garbage self-expression is immoral and horrible. You're right. I confess this joke was going too far. Free speech, free press and free expression of ideas is not something to take so lightly. I'm with you on this point. But, since the biggest crime in Xah Lee's opinion apparently is harming and damaging society through expression of ideas, it must be possible to judge him by his own standards. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to communicate via USB port
On Apr 18, 12:54 am, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Can someone explain how I would read the data from the USB port? I don't know if it matters, but I am trying to read the data from a GPS plugged in to the USB port. Thank you, Robin Just a guess, but can you use pyserial to talk to USB001? -- Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: exception just to avoid output error (newbie)
Flyzone wrote:
Hi
I'm trying to delete some files, but i get an exception error if the
file don't exist.
I can use an {if fileexist(file) then delete}, but it will get cpu
time.
So i catch the exception with:
try: os.remove(filename)
except EnvironmentError: error=1
If i just want to avoid the output error, is this the right way to
write the code?
I don't care of get if is in error, but an except EvironmetError
without the : will give me a sytax error.
Am I too much complicated? :-)
Thanks in advance
You got it! Not to complicated--just right. I would make the tiniest of
changes for style and speed:
try:
os.remove(filename)
except EnvironmentError:
pass
But what you have already is fine.
James
--
http://mail.python.org/mailman/listinfo/python-list
How? Movable yet? Click here to join!
How? Movable yet? Click here to join! AsiaFriendFinder http://www.9fy.cn/love/friends/ -- http://mail.python.org/mailman/listinfo/python-list
unicode data - accessing codepoints FFFF on narrow python builts
Hi all,
I'd like to ask about the usage of unicode data on a narrow python build.
Unicode string literals \N{name} work even without the (explicit) import of
unicodedata and it correctly handles also the wider unicodes planes - over
u\N{LATIN SMALL LETTER E}
u'e'
u\N{GOTHIC LETTER AHSA}
u'\U00010330'
The unicode data functions works analogous in the basic plane, but behave
differently otherwise:
unicodedata.lookup(LATIN SMALL LETTER E)
u'e'
unicodedata.lookup(GOTHIC LETTER AHSA)
u'\u0330'
(0001 gets trimmed)
Is it a bug in unicodedata, or is this the expected behaviour on a narrow build?
Another problem I have is to access the characters and their properties by
the respective codepoints:
under it is possible, to use unichr(), which isn't valid for higher
valules on a narrow build
It is possible to derive the codepoint from the surrogate pair, which would be
usable also for wider codepoints.
Currently, I'm using a kind of parallel database for some unicode ranges above
, but I don't think, this is the most effective way.
I actually found something similar at http: / /
inamidst.com/phenny/modules/codepoint.py using directly the UnicodeData.txt;
but I was wondering, If there is a simpler way for doing that; it seems
obvious, that the data are present, if it could be used for constucting unicode
literals.
Any hints are welcome, thanks.
vbr
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Re: Python Feature Request: Allow changing base of member indices to 1
Dustan wrote: For newbies, it's easier to count starting with 1. It's rather unintuitive to start at 0. Cool. So Python will become a newbie language, and everyone that jumps from Python to a different language will have to relearn 0-based indices? ;) Regards, Björn -- BOFH excuse #418: Sysadmins busy fighting SPAM. -- http://mail.python.org/mailman/listinfo/python-list
2.5 from source install problem with extensions
Hi! I am doing a from source installation of Python 2.5 on some old Debian machine. As the target directoy I want /opt/somename so i added it to the configure like so: ./configure --prefix=/opt/somedir The following make works fine as far as I can see. Then the make install also actually works and installs python in /opt/somedir with all its subdirectoris (bin, lib, man, include). The extensions (*.so) however get put in /usr/local/lib/... and there also in the wrong python directoy: 2.4 This is a c/p of the make install output: [...] running build_scripts running install_lib changing mode of /usr/local/lib/python2.4/site-packages/_struct.so to 755 changing mode of /usr/local/lib/python2.4/site-packages/_ctypes.so to 755 [...] (How) can I change the install_dir for the extensions? Why does it use python2.4 anyway?! What env var or else is set here that I cannot find? thanks! -- http://mail.python.org/mailman/listinfo/python-list
array{uint32}
Guys,
I have a function that returns a array{uint32}, is there any way to output
that to screen in a more user friendly format? At the moment when I print it
by itself it appears as [65541L], which isn't much used to anyone.
I know this is probably a REALLY dumb question but I'm a little lost with
this API, its driving me nuts.
Thanks again guys,
Rob
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Re: What makes an iterator an iterator?
Steven D'Aprano wrote:
class SortedDict(dict):
def __iter__(self):
for key in sorted(self.keys()):
yield key
Note that using sorted(self) does not work.
That's because sorted() invokes __iter__() if present. To prevent the
recursion you can explicitly invoke dict.__iter__():
class SortedDict(dict):
... def __iter__(self):
... return iter(sorted(super(SortedDict, self).__iter__()))
...
sd = SortedDict(a=1, b=2, c=3)
list(sd)
['a', 'b', 'c']
Note that a list of keys is still built before the first key is yielded,
and, unlike dict, you can modify your SortedDict while iterating over it:
for k in sd:
... if k == b: sd[x] = 42
...
sd
{'a': 1, 'x': 42, 'c': 3, 'b': 2}
whereas:
d = dict(a=1, b=2, c=3)
for k in d:
... if k == b: d[x] = 42
...
Traceback (most recent call last):
File stdin, line 1, in module
RuntimeError: dictionary changed size during iteration
By the way, I think it would be worthwile to change super() to allow
e. g. super(SomeClass, self)[...] as an alternate spelling for
super(SomeClass, self).__getitem__(...) etc. With such an enhancement
SortedDict would become
class SortedDict(dict):
def __iter__(self):
# doesn't work in current Python
iter(sorted(super(SortedDict, self)))
Peter
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Re: What makes an iterator an iterator?
Stefan Rank schrieb: on 18.04.2007 07:39 Steven D'Aprano said the following: I thought that an iterator was any object that follows the iterator replace object with instance of a class, i.e. the relevant methods are looked up in the __class__ not in the instance (I think). I had the same troubles trying to dynamically reassign a __call__ method... This is correct. It's not properly documented though, and not applied consistently, e.g. __enter__ and __exit__ are looked up in the instance itself. Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Feature Request: Allow changing base of member indices to 1
On 2007-04-14, Paddy [EMAIL PROTECTED] wrote:
On Apr 14, 11:27 am, [EMAIL PROTECTED] wrote:
This is like the previous one. Please check for sanity and approve for
posting at python-dev.
I would like to have something like option base in Visual Basic.
IIRC it used to allow me to choose whether 0 or 1 should be used as
the base of member indices of arrays. In Python, the same can be used
with strings, lists, tuples etc.
This would mean:
foo = foo
= foo[1] == 'f'
foo = ['foo', 'bar', 'spam' ]
= foo[1] == 'foo'
foo = ('spam', 'eggs')
= foo[1] == 'spam'
For convenience it should also affect the range function so that:
range(3) = [1, 2, 3]
because this is often used where arrays would be used in VB.
Finally, when the programmer does not specify his choice of base at
the beginning of the program, the current behaviour of using 0 as base
should continue so that there is no problem with backward
compatibility.
Here is a document giving good reasons for indexing to start at
zero, as in Python.
I find he just picks the reasons he agrees with.
If you pick your values as a = i = b it has the advantage that
the bounds are explicit. No need to add or substract 1 from
one of the values to get the exact boundis. Now how much weight
you want to give this characteristic is open for debate but
the fact that it isn't even mentioned doesn't give me much
confidence in the author's ability to weight all the pro's
and con's.
http://www.cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD831.html
The author has done a bit:
http://en.wikipedia.org/wiki/Dijkstra
Having more than one index start point would be a maintenance
nightmare best avoided. (It can be done in Perl).
It was never a problem when I still programmed in Pascal.
--
Antoon Pardon
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Re: multiremberco
[EMAIL PROTECTED] wrote: I have modified, simplified and (hopefully) improved Steven's code like this (but it may be a bit slower, because the class It is inside the function?): Here is a yet more simple version, I wonder if it still does the same thing, whatever it is you are looking for :-) def xsplitter(iseq, pred): class It(object): def __init__(self, fun, parity): self.divert = fun self.parity = parity self.queue = collections.deque() def append(self, item): self.queue.append(item) def __iter__(self): while self.queue: yield self.queue.popleft() for item in iseq: if pred(item) == self.parity: yield item else: self.divert(item) for x in self: yield x it1 = It(lambda y: it2.append(y), True) it2 = It(lambda y: it1.append(y), False) return it1, it2 A. -- http://mail.python.org/mailman/listinfo/python-list
no trace of PyRun_SimpleString() ???
Hi, it seems like I can't trace scripts run by PyRun_SimpleString(): a=0 def test(frame, event, arg): global a a+=1 import sys sys.settrace(test) print a print a print a - 0 0 0 Does anybody know how I can get something similar with the C-Funcs for Tracing?? -- http://mail.python.org/mailman/listinfo/python-list
Re: Future Python Gui?
On Apr 18, 2:07 am, Richard Jones [EMAIL PROTECTED] wrote: kirkjobsluder wrote: I'd say that the best bet is to learn swig and similar bridging, expanding, and embedding mechanisms. For GUI programming this would seem overkill. Pick a GUI toolkit and it's almost guaranteed to be wrapped for use in Python already. Perhaps a bit. I'm not saying that everyone should wrap their own code, but many of the currently existing wrappers are quite thin, and understanding how to use and debug wrapped GUI code might put one in a better position over knowing a particular toolkit. Richard -- http://mail.python.org/mailman/listinfo/python-list
Re: 2.5 from source install problem with extensions
On Apr 18, 12:36 pm, Florian Demmer [EMAIL PROTECTED] wrote: Hi! I am doing a from source installation of Python 2.5 on some old Debian machine. As the target directoy I want /opt/somename so i added it to the configure like so: ./configure --prefix=/opt/somedir The following make works fine as far as I can see. Then the make install also actually works and installs python in /opt/somedir with all its subdirectoris (bin, lib, man, include). The extensions (*.so) however get put in /usr/local/lib/... and there also in the wrong python directoy: 2.4 ...and the current /usr/bin/python symlink points to the 2.4 installation (from .deb) This is a c/p of the make install output: [...] running build_scripts running install_lib changing mode of /usr/local/lib/python2.4/site-packages/_struct.so to 755 changing mode of /usr/local/lib/python2.4/site-packages/_ctypes.so to 755 [...] (How) can I change the install_dir for the extensions? Why does it use python2.4 anyway?! What env var or else is set here that I cannot find? thanks! -- http://mail.python.org/mailman/listinfo/python-list
X root Operator help
I'm currently new to Python and I haven't been able to find the operator/math function to find the square root or even the x root of a number. I'm rewriting a program that I wrote in BASIC that does the math of a quadratic equation (user puts in a, b, and c values) and tells the user whether it has 1 root, 2 roots, or no real roots and displays the roots if it has real roots. Thanks in advance, Dan -- http://mail.python.org/mailman/listinfo/python-list
Re: X root Operator help
lucidparadox wrote: I'm currently new to Python and I haven't been able to find the operator/math function to find the square root or even the x root of a number. Without ever having used it, I would guess it's the sqrt function in the math module. (Possibly also of interest: the pow function in that same module) TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Signals
On Wed, 2007-04-18 at 08:39 +0100, Robert Rawlins - Think Blue wrote: Hello Chaps, I posted about this the other day but I’m still struggling to get any form of result from it. Basically I have the following piece of code, and according to its API is produces singals when particular events occur, but i have no idea how to list for events, I’ve tried all sorts of combinations using the signal module but haven’t been able to get it working. [...] import dbus, signal [...] Now here is a copy of the API documentation that lists the signals thrown by the API, this is the one I’m trying to listen for. void RemoteDeviceFound(string address, uint32 class, int16 rssi) This signal will be send every time an inquiry result has been found by the service daemon. In general they only appear during a device discovery. Basically I’m just looking to run a function that will print those details to screen. Can anyone help with working out how to listen for this signal? The signal module is for handling process signals the operating system sends to your python process. The API you're using (dbus, a crucial detail you neglected to mention before) doesn't send this kind of signal. Googling for 'python dbus documentation' brings up http://dbus.freedesktop.org/doc/dbus-python/api/ , which seems to explain everything you need. You need to get an instance of dbus.Interface, which you seem to have done, and call its connect_to_signal() method, which you don't seem to have done. I’d also like to know how i can keep the application running until I decided to stop it manually, as the DiscoverDevices() can take a while to complete and send out several RemoteDeviceFound() signals in that period. The very first section of the above mentioned documentation talks about needing a main loop for receiving signals, and it provides example boilerplate code for how to set up a main loop. Hope this helps, Carsten. -- http://mail.python.org/mailman/listinfo/python-list
Python crash after using weave inline
Hi,
I have a strange and very annoying problem when using weave in scipy..
when I run the code below.. the first time it needs to compile.. it
says compiling and then python.exe crashes! and no result is shown..
the second time i run it, it does not compile but gives the completely
wrong answer.. prints a matrix of all zeros except for point 1,1 in
the matrix which seems to have some random high number like
-5.39403959e+08. !!??
Basicly I run through a 10 by 10 matrix do some calculations with
respect to some center values x_c and y_c and insert the result into
the empty numpy matrix array res.
Any help is appreciated!
Thanks,
Sroren
from numpy import *
from scipy import weave
from scipy.weave import converters
def cartPolFast(xlen, ylen, x_c, y_c):
res = zeros((xlen,ylen))
code =
{
int xlen, ylen, x_c, y_c;
double rel_x, rel_y;
int x, y;
for( x = 0; x == xlen; x++)
for( y = 0; y == ylen; y++)
rel_x = x-x_c;
rel_y = y_c-y;
res(x,y) = rel_y*rel_y;
}
weave.inline(code,['xlen','ylen','x_c','y_c','res'],
type_converters=converters.blitz, compiler=gcc)
return res
if __name__ == __main__:
tst = cartPolFast(10,10,5,5)
print tst
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Re: X root Operator help
lucidparadox wrote: I'm currently new to Python and I haven't been able to find the operator/math function to find the square root or even the x root of a number. For square root, use math.sqrt(y) For x root use y**(1/x) I'm rewriting a program that I wrote in BASIC that does the math of a quadratic equation (user puts in a, b, and c values) and tells the user whether it has 1 root, 2 roots, or no real roots and displays the roots if it has real roots. In floating point arithmetic, the naive way of calculating both roots always using the formula (-b +/- sqrt(b**2 - 4*a*c))/2*a will give you inaccurate results sometimes. See http://www.cse.uiuc.edu/eot/modules/floating_point/quadratic_formula/. For a better formula, see how r_1 and r_2 are defined in http://en.wikipedia.org/wiki/Quadratic_equation#Alternative_formula. -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
Re: please sort this out
hi all,
I solved the problem with the help of python cookbook+matplotlib
I was getting the main error as *
raise RuntimeError('%s' is not a writable dir; you must set
environment variable HOME to be
*
* a writable dir %h)*
Matplotlib needs the environment variable HOME to point to a writable
directory.Thats why i did
os.environ[ 'HOME' ] = 'C:/temp'
and the cgi-script worked.
For further questions about cgi+matplotlib/networkx please see
http://www.scipy.org/Cookbook. Its very useful
Thanks,
Piyali Biswas
On 4/16/07, piyali biswas [EMAIL PROTECTED] wrote:
Hi,
I am using networkx and pylab for creating a graph using a python script
abc.py.
I have saved the networkx folder in C:/Python24/Lib/site-packages.
When I run the script from command prompt, it creates the graph and saves
it to the place I want to but when I write a python-cgi script and run it as
os.system('python abc.py')
it doesn't gives me any result.
I have included the path of my system using
os.environ['PATH'] = ..
I also appended the path of networkx directory using
sys.path.append('C:/Python24/Lib/site-packages') as it seems to me that it
is a path related problem and the cgi result page shows error
(1) networkx *undefined*
(2)* *drawing undefined
(3) nx_pylab *undefined*
(4) matplotlib *undefined*
*(5)
raise RuntimeError('%s' is not a writable dir; you must set environment
variable HOME to be
*
* a writable dir %h)*
Can you please tell me how to enable cgi to run this program on runtime. I
have kept both the cgi script as well as python script in Apache/cgi-bin
folder.
Thanks,
Piyali
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Wanted: Email Client with GUI
Hi, although I have googled, I didn't find a Python email client program fitting to my needs. What I want is a program (it doesn't have to be so sophisticated as thunderbird) written totally in python and using a gui toolkit like pyqt, pygtk, wxpyhton or tkinter. Who knows such a program? ;) best regards, -- http://mail.python.org/mailman/listinfo/python-list
Re: Win32com, and Excel issues.
On Apr 18, 2:38 am, Ant [EMAIL PROTECTED] wrote: Hi all, I'm doing some Excel automation work for a friend, and am developing on a machine running Office 2000. My friends machine is running Excel 2003. The code I've written works like a charm on my machine (in fact all three of my machines), but falls over early on on Excel 2003. The code snippet it falls over on is code to copy one worksheet after another: app = wincl.Dispatch(Excel.Application) app.Visible = True app.Workbooks.Open(self.filename) sheet = app.Worksheets(1) sheet.Copy(None, sheet) and this last line throws the following exception: pywintypes.com_error: (-2147417851, 'the server threw an exception.' , None, None) which isn't too helpful. I'm wondering if something has changed in the Excel API that doesn't allow a null parameter to Copy or some similar issue. I tried using the keyword argument format, but that simply refused to work. Other relevant information: * The program is packaged using py2exe, so I know that the same version of Python, and the same libraries are on each machine. * One of the test machines running Excel 2000 does not have Python installed. * The machines are all of a similar spec. Any ideas are welcome! I can't find anything about copying a worksheet, but I found a some fairly detailed information about COM objects and getting more information about Python's bindings to them here: http://www.oreilly.com/catalog/pythonwin32/chapter/ch12.html or here: http://mathieu.fenniak.net/plotting-in-excel-through-pythoncom/ Hopefully this will give you some pointers. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: Help on Shelve....
On Apr 17, 5:52 pm, Michael Bentley [EMAIL PROTECTED] wrote: On Apr 17, 2007, at 6:52 AM, Clement wrote: Can i useShelvefor storing large amount of data around 6GB.. Is it stable...? if any problems come, can i retrive the document.. Do you know for sure your filesystem handles files that big? I am using NTFS that can hold more that 500GB of data -- http://mail.python.org/mailman/listinfo/python-list
Re: python - dll access (ctypes or swig)
Alex Martelli wrote: Larry Bates [EMAIL PROTECTED] wrote: recently learned that you can ship COM as either an .EXE or a .DLL (nobody has yet let me know why). The why is pretty obvious -- you may want to be able to instantiate a COM object either in-process, or in its own separate process, depending on that object's nature. For example, a complete application that when running exposes COM objects to let other processes drive/script it will be an EXE file since it can also run independently. In general I'm no big fan of MS's design, but COM, despite its imperfections, was in fact seriously good (Don Box's Essential COM, an excellent book, went just into enough depth to let a developer really appreciate that, IMHO). I'm using the past tense because MS has been trying to kill COM for a while now (but I notice that Essential COM, while 10 years-old, is _still_ in stock at Amazon -- so, I guess that so far MS's attempts haven't _quite_ succeeded yet:-). Alex I guess I was the only one it wasn't obvious to grin. I've always written my COM servers as .EXE files even though they cannot be run independently. What I find is odd is that I can create a .DLL or an .EXE of my COM server and after I register it, my application doesn't appear to know the difference. The difference seems to be hidden from the actual application and doesn't affect it (at least that I can determine). I also think COM works quite well and I've found it much easier to use than C-style DLLs that many vendors ship as their API. Most of what I've learned came from Mark/Andy's Python Programming on Win32 and trial-and-error so my knowledge is quite limited. Thanks for the info. Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: How to Passs NULL as a IDispatch Pointer to method?
Yingpu Zhao wrote: Thanks to Larry. I want to pass the IDispatch pointer of other COM object to AddShapeInfo or pass null to tell x do nothing. for example. Rect= Dispatch(Rect.Document) ShapeSet = Dispatch(xxx.Document) ShapeSet.AddShapeInfo(Rect, 0, Shape) or ShapeSet.AddShapeInfo(EmptyShape, 0, None) I think you will need to pass a basically empty class that is wrapped in an IDispatch object. See my earlier example. -Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling private base methods
C++'s and Java's approaches are vitiated by an unspoken assumption that the library's designer is some kind of demigod, while the writer of code that uses the library is presumably still struggling with the challenge of opposable thumbs. That might be your point of view. To me, the library designer is the one that has done the homework and should know better how to simplify things for others not a God. No one uses a high level library if implementing the low-level your self is easier. Libraries provide functionality that allow the application programmer to concentrate in what he is being paid for, making the application. An application programmer will have to define what the correct interface for the application is (for example, what UI to provide). There will be users that will say, I wish this application had a way of doing this, but unless they were technically savy and wanted to spend the necessary time to understand how the application works, they would not write the feature themselves; they will request that feature to the programmer. In real life, the skills of the two people in question are likely to be much closer, and since designing libraries for use in all kinds of applications is a really hard task, it's likelier than the library designer will make an error in designing his or her library, rather than the application programmer in using that library. Those are called defects or bugs. When I find a bug in a library or an application, I submit a bug report. I might have to work around it for a little bit, but I don't just work around it and call it goods. Library designers are normal programmers that work under a set of requirements like any other programmer (application programmers included), but when I find a bug in an application, I report it and try to work around it until it gets fixed; I don't hack the application or re-write my own just because a found a bug. Purely-advisory encapsulation approaches, like Python's, even the odds. Actually, I'd argue that even double-leading-underscores are overkill more often than not (and single-leading-underscores the compromise that is generally prefereable). You see it as an intelligence challenge, where I see it as making things easier for everybody. Thanks, - Isaac. -- http://mail.python.org/mailman/listinfo/python-list
Re: Help on Shelve....
On Apr 17, 5:52 pm, Michael Bentley [EMAIL PROTECTED] wrote: On Apr 17, 2007, at 6:52 AM, Clement wrote: Can i useShelvefor storing large amount of data around 6GB.. Is it stable...? if any problems come, can i retrive the document.. Do you know for sure your filesystem handles files that big? I am using NTFS filesystem that can handle more than 500GB files -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
class Parrot(object): def __iter__(self): return self def __init__(self): Typo right here self.next = self._next() write: self.next = self._next no parenthesis. def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word See previous explanation. thanks, - Isaac. -- http://mail.python.org/mailman/listinfo/python-list
Re: looking for library to read ppt files
Not really a Python question but Google turned up: it is a python question. i'm not looking for a program, i'm looking for a library. my goal is to convert ppt to jpegs but later i wish to convert to swf and maybe implement animations I suppose you could also use the win32 module and the COM object to grab the info from the slide and then use the PIL module to create a jpeg. Sounds like a lot of head banging to me, but it might be an interesting project. i can't use win32 because it should work on linux since it will be used as server-side application. -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
Sorry, my previous post was incomplete. I didn't realized that you implemented _next() as a generator funcition. Besides changing __init__() from self.next = self._next() to self.next = self._next you need to implement __iter__() as: return self.next() class Parrot(object): def __iter__(self): return self def __init__(self): self.next = self._next() def _next(self): for word in Norwegian Blue's have beautiful plumage!.split(): yield word -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling private base methods
After all, that's what duck-typing is about. There is no official interface declaration, just an implicit protocol. And private methods or members are part of that protocol as well. I don't think so. Duck-typing is about implementing the expected public interface, and has nothing to do with accessing private members of a class, nor overriding those members. - Isaac. -- http://mail.python.org/mailman/listinfo/python-list
solved
hi all,
I solved the problem with the help of python cookbook+matplotlib
I was getting the main error as *
raise RuntimeError('%s' is not a writable dir; you must set
environment variable HOME to be
*
* a writable dir %h)*
Matplotlib needs the environment variable HOME to point to a writable
directory.Thats why i did
os.environ[ 'HOME' ] = 'C:/temp'
and the cgi-script worked.
For further questions about cgi+matplotlib/networkx please see
http://www.scipy.org/Cookbook. Its very useful
Thanks,
Piyali Biswas
--
http://mail.python.org/mailman/listinfo/python-list
Re: Help on Shelve....
On Apr 17, 5:52 pm, Michael Bentley [EMAIL PROTECTED] wrote: On Apr 17, 2007, at 6:52 AM, Clement wrote: Can i useShelvefor storing large amount of data around 6GB.. Is it stable...? if any problems come, can i retrive the document.. Do you know for sure your filesystem handles files that big? I am using NTFS that can hold more that 500GB of data -- http://mail.python.org/mailman/listinfo/python-list
Re: looking for library to read ppt files
On Wed, 2007-04-18 at 06:30 -0700, Aljosa Mohorovic wrote: Not really a Python question but Google turned up: it is a python question. i'm not looking for a program, i'm looking for a library. my goal is to convert ppt to jpegs but later i wish to convert to swf and maybe implement animations I suppose you could also use the win32 module and the COM object to grab the info from the slide and then use the PIL module to create a jpeg. Sounds like a lot of head banging to me, but it might be an interesting project. i can't use win32 because it should work on linux since it will be used as server-side application. How about running a headless OpenOffice instance and remote-controlling it with pyuno: http://udk.openoffice.org/python/python-bridge.html -Carsten -- http://mail.python.org/mailman/listinfo/python-list
Re: How to communicate via USB port
On 2007-04-18, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Can someone explain how I would read the data from the USB port? You can't. There's no such thing from a SW point of view. ;) I don't know if it matters, but I am trying to read the data from a GPS plugged in to the USB port. It's probably a serial device. Try using pyserial to talk to /dev/ttyUSB0. -- Grant Edwards grante Yow! Used staples are good at with SOY SAUCE! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Wanted: Email Client with GUI
On Apr 18, 8:07 am, Franz Steinhaeusler [EMAIL PROTECTED] wrote: Hi, although I have googled, I didn't find a Python email client program fitting to my needs. What I want is a program (it doesn't have to be so sophisticated as thunderbird) written totally in python and using a gui toolkit like pyqt, pygtk, wxpyhton or tkinter. Who knows such a program? ;) best regards, I'm not finding much either. There is this: http://sourceforge.net/projects/usablemail/ This also looked promising: http://wiki.laptop.org/go/Email It looks like their might be some kind of tkinter email client in the Programming Python book by Lutz. ( See http://proquest.safaribooksonline.com/0596000855/python2-CHP-11-SECT-4 ) Hope that helps. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: How to better pickle an extension type
Thanks for your replies. The code I showed above was pyrex code, not python code. You are correct that python objects do not require .__reduce__() to be picklable, but apparently c extension types do (makes sense, they must be more opaque to the python machinery). I'll try the .__newobj__(), see if I can get it to do what I want... On Apr 17, 2:50 am, Ziga Seilnacht [EMAIL PROTECTED] wrote: dgdev wrote: I would like topicklean extension type (written inpyrex). I have it working thus far by defining three methods: class C: # for pickling __getstate__(self): ... # make 'state_obj' return state_obj __reduce__(self): return C,(args,to,__init__),me.__getstate__() # for unpickling __setstate__(self,state_obj): self.x=state_obj.x ... This gets the class pickling and unpickling. However, I'd like to not specify arguments for __init__ (as I do now in __reduce__), and so not have __init__ invoked during unpickling. I would like to have the pickling machinery somehow create an uninitialized object, and then call its __setstate__, where I can re- create it from 'state_obj'. Is there a kosher way to do so, that is without me having to have a special mode in the constructor for when the object is being created by the unpickler? Why are you overwriting the __reduce__() method? The default object.__reduce__() method, inherited by all new style classes, already does what you want. If you really must overwrite it, and you don't want __init__() to get called, then you should return a reconstructor named __newobj__() as the first item of reduce tuple. Something like this: def __newobj__(cls, *args): ... return cls.__new__(cls, *args) ... class C(object): ... def __init__(self): ... print I shouldn't be called at reconstruction ... def __reduce__(self): ... try: ... getnewargs = self.__getnewargs__ ... except AttributeError: ... newargs = (self.__class__,) ... else: ... newargs = (self.__class__,) + getnewargs() ... try: ... getstate = self.__getstate__ ... except AttributeError: ... # this ignores __slots__ complications ... state = self.__dict__ ... else: ... state = getstate() ... # this ignores list and dict subclasses ... return __newobj__, newargs, state ... c = C() I shouldn't be called at reconstruction importpickle for proto in range(3): ... assert isinstance(pickle.loads(pickle.dumps(c, proto)), C) ... Ziga -- http://mail.python.org/mailman/listinfo/python-list
Re: array{uint32}
I have a function that returns a array{uint32}, is there any way to output
that to screen in a more user friendly format? At the moment when I print it
by itself it appears as [65541L], which isn't much used to anyone.
I'm not sure I understand your question precisely but this might help:
mylist = [65541L]
mylist
[65541L]
mylist[0]
65541L
int(mylist[0])
65541
--
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Re: Wanted: Email Client with GUI
On 18 Apr 2007 07:09:29 -0700, [EMAIL PROTECTED] wrote: On Apr 18, 8:07 am, Franz Steinhaeusler [EMAIL PROTECTED] wrote: Hi, although I have googled, I didn't find a Python email client program fitting to my needs. What I want is a program (it doesn't have to be so sophisticated as thunderbird) written totally in python and using a gui toolkit like pyqt, pygtk, wxpyhton or tkinter. Who knows such a program? ;) best regards, I'm not finding much either. There is this: http://sourceforge.net/projects/usablemail/ This also looked promising: http://wiki.laptop.org/go/Email It looks like their might be some kind of tkinter email client in the Programming Python book by Lutz. ( See http://proquest.safaribooksonline.com/0596000855/python2-CHP-11-SECT-4 ) Hope that helps. Mike Thanks, that I also found already. I know XPN, which has also some email functionality. I only wonder, why there doesn't exist a nice one. Oh, I here, why do you not write such a thing yourself? It fails on lack of time. ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: X root Operator help
On Apr 18, 8:52 am, Michael Hoffman [EMAIL PROTECTED] wrote: lucidparadox wrote: I'm currently new to Python and I haven't been able to find the operator/math function to find the square root or even the x root of a number. For square root, use math.sqrt(y) For x root use y**(1/x) I'm rewriting a program that I wrote in BASIC that does the math of a quadratic equation (user puts in a, b, and c values) and tells the user whether it has 1 root, 2 roots, or no real roots and displays the roots if it has real roots. In floating point arithmetic, the naive way of calculating both roots always using the formula (-b +/- sqrt(b**2 - 4*a*c))/2*a will give you inaccurate results sometimes. See http://www.cse.uiuc.edu/eot/modules/floating_point/quadratic_formula/. For a better formula, see how r_1 and r_2 are defined in http://en.wikipedia.org/wiki/Quadratic_equation#Alternative_formula. -- Michael Hoffman Thanks. As of right now I'm just trying to familiarize myself with the syntax of Python. Actually I should have thought of y**(1/x). I'm currently a freshman in college so the alternative formula hasn't been introduced to me yet. Thanks for the pointers though. Dan Collins -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling private base methods
Isaac Rodriguez [EMAIL PROTECTED] wrote: In real life, the skills of the two people in question are likely to be much closer, and since designing libraries for use in all kinds of applications is a really hard task, it's likelier than the library designer will make an error in designing his or her library, rather than the application programmer in using that library. Those are called defects or bugs. When I find a bug in a library or an application, I submit a bug report. I might have to work around it for a little bit, but I don't just work around it and call it goods. Library designers are normal programmers that work under a set of requirements like any other programmer (application programmers included), but when I find a bug in an application, I report it and try to work around it until it gets fixed; I don't hack the application or re-write my own just because a found a bug. You appear to have led a very sheltered life if the only libraries you ever use are ones where you can always get a change to the library api in a timely manner. In the particular case where I hacked around a private variable, the library in question was burned into ROM on thousands of consumer devices. Getting the library to change simply wasn't an option. -- http://mail.python.org/mailman/listinfo/python-list
RE: Signals
Thanks Carsten,
Sorry for not mentioning the dbus before, I thought that the signals were a
general python thing, I didn’t realize it was a specific dbus thing.
I've now modified the code so it looks like this.
#!/usr/bin/python
import dbus
from gobject import MainLoop, idle_add
from dbus.mainloop.glib import DBusGMainLoop
def main_function():
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.bluez',
'/org/bluez'),'org.bluez.Manager')
adapter = dbus.Interface(bus.get_object('org.bluez',
manager.DefaultAdapter()),'org.bluez.Adapter')
def remote_device_found(addr, class_, rssi):
print 'Found:', addr
adapter.connect_to_signal('RemoteDeviceFound', remote_device_found)
adapter.DiscoverDevices()
if __name__ == '__main__':
idle_add(main_function)
dbus_mainloop_wrapper = DBusGMainLoop(set_as_default=True)
mainloop = MainLoop()
mainloop.run()
Which should implement the main loop and keep the application alive, however
when running the program I get the following error thrown at me.
File ./scan4.py, line 5, in ?
from dbus.mainloop.glib import DBusGMainLoop
ImportError: No module named mainloop.glib
Any ideas what might be causing this? My guess is that I don’t have one of the
dependency installed properly, but I have no idea which ones I need.
Thanks for any more help you can offer, its greatly appreciated.
Rob
-Original Message-
From: Carsten Haese [mailto:[EMAIL PROTECTED]
Sent: 18 April 2007 13:43
To: Robert Rawlins - Think Blue
Cc: python-list@python.org
Subject: Re: Signals
On Wed, 2007-04-18 at 08:39 +0100, Robert Rawlins - Think Blue wrote:
Hello Chaps,
I posted about this the other day but I’m still struggling to get any
form of result from it. Basically I have the following piece of code,
and according to its API is produces singals when particular events
occur, but i have no idea how to list for events, I’ve tried all sorts
of combinations using the signal module but haven’t been able to get
it working.
[...]
import dbus, signal
[...]
Now here is a copy of the API documentation that lists the signals
thrown by the API, this is the one I’m trying to listen for.
void RemoteDeviceFound(string address, uint32 class, int16
rssi)
This signal will be send every time an inquiry result
has been found by the service daemon. In general they
only appear during a device discovery.
Basically I’m just looking to run a function that will print those
details to screen. Can anyone help with working out how to listen for
this signal?
The signal module is for handling process signals the operating system
sends to your python process. The API you're using (dbus, a crucial
detail you neglected to mention before) doesn't send this kind of
signal.
Googling for 'python dbus documentation' brings up
http://dbus.freedesktop.org/doc/dbus-python/api/ , which seems to
explain everything you need. You need to get an instance of
dbus.Interface, which you seem to have done, and call its
connect_to_signal() method, which you don't seem to have done.
I’d also like to know how i can keep the application running until I
decided to stop it manually, as the DiscoverDevices() can take a while
to complete and send out several RemoteDeviceFound() signals in that
period.
The very first section of the above mentioned documentation talks about
needing a main loop for receiving signals, and it provides example
boilerplate code for how to set up a main loop.
Hope this helps,
Carsten.
--
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Re: python - dll access (ctypes or swig)
thank you for the responses and the links. I will give these ideas a try this week and post again if I have more questions. Thanks again for being so helpful! Daniel On 4/17/07, Cameron Laird [EMAIL PROTECTED] wrote: In article [EMAIL PROTECTED], Larry Bates [EMAIL PROTECTED] wrote: Daniel Watrous wrote: Hello, I am interested in using python to script access to some hardware for which there are existing drivers in the form of DLLs. The DLLs each have four exported functions and a host of COM Properties and COM Methods. The four exported functions are as follows: DllCanUnloadNow DllGetClassObject DllRegisterServer DllUnregisterServer The COM methods and properties all begin with I, followed by a unique name. I am able to load the DLL using ctypes and it can access the exported functions, but I'm not sure how to access the COM methods and properties. I have read that ctypes once had support for COM but that it has since been separated into its own project. I couldn't find any information about how these work together. All help is appreciated. THANKS in advance... Daniel I recently learned that you can ship COM as either an .EXE or a .DLL (nobody has yet let me know why). You don't have a traditional .DLL that you would use ctypes to call methods in, you have a COM .DLL. COM methods need to be access with Win32com obj=win32com.client.Dispatch(typelib name). You need to find out the COM dispatch typelib name and make sure the DLL is registered (regsvr32 your.dll). -Larry Is this--adroit use of Win32com with special-purpose DLLs--written up anywhere? Doing this with unusual hardware that turns up in the real world is ENTIRELY more satisfying than trying to wrangle the Visual C bindings that vendors usually push, but, apart from Mark and Andy's book, now over seven years old, I know of no appropri- ately ambitious tutorial in the subject. Daniel, do you have what you need to make progress? Have you seen URL: http://www.oreilly.com/catalog/pythonwin32/ ? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: The smallest and largest values of numeric types
On Apr 18, 3:09�am, Steven D'Aprano [EMAIL PROTECTED] wrote: On Wed, 18 Apr 2007 07:15:11 +0200, Hendrik van Rooyen wrote: I once made a thing that tried to find the limit of longs and stopped when I had two or three screenfulls of numbers. You should find that converting longs to strings (say, for printing them) is *very* slow. E.g. the following code big = 10L**100 # one google, a big number while True: � � print big # so we can see the last value before it fails � � big *= 10 will run terribly slow and should be written as: big = 10L**100 # one google, a big number try: � � while True: � � � � big *= 10 except: # don't know what exception will be raised, so catch ANYTHING � � print len(str(big))-1 # the number of digits only does the slow conversion to string once, instead of every time around the loop. However, once your machine starts paging, it will still slow down a lot. I came to the conclusion that for integer arithmetic like this, the limit is either your memory size, or some other number that is so big that in practice you don't have to worry about it.. Yes, longs are limited only by the amount of memory accessible. But there may be other limitations even if you have the memory. For example, this test is limited to generation 10 because tne 11th generation produces outrageous exponent error. Here, every 9th 1st generation, starting from the fifth is a second generation, every 9th sencond, starting from the fifth, is a 3rd generation, every 9th 3rd gen, starting from the 5th is a 4th gen, etc. Closed form: Type12MH(k,i) Find ith, kth Generation Type [1,2] Mersenne Hailstone using the closed form equation 2**(6*((i-1)*9**(k-1)+(9**(k-1)-1)/2+1)-1)-1 2**5-1 generation: 1 2**29-1 generation: 2 2**245-1 generation: 3 2**2189-1 generation: 4 2**19685-1 generation: 5 2**177149-1 generation: 6 2**1594325-1 generation: 7 2**14348909-1 generation: 8 2**129140165-1 generation: 9 2**1162261469-1 generation:10 1.797 seconds There is never a number too large to worry about. -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: Help on Shelve....
On Apr 18, 2007, at 8:19 AM, Clement wrote: On Apr 17, 5:52 pm, Michael Bentley [EMAIL PROTECTED] wrote: On Apr 17, 2007, at 6:52 AM, Clement wrote: Can i useShelvefor storing large amount of data around 6GB.. Is it stable...? if any problems come, can i retrive the document.. Do you know for sure your filesystem handles files that big? I am using NTFS filesystem that can handle more than 500GB files Ye looks like your filesystem can theoretically handle 16tb files. I'm afraid I don't know the answer to your question -- seems like it should work ;-) How about trying it out and reporting back? -- http://mail.python.org/mailman/listinfo/python-list
Re: python - dll access (ctypes or swig)
Larry Bates [EMAIL PROTECTED] wrote: ... I guess I was the only one it wasn't obvious to grin. I've always written my COM servers as .EXE files even though they cannot be run independently. What I find is odd is that I can create a .DLL or an .EXE of my COM server and after I register it, my application doesn't appear to know the difference. The difference seems to be hidden from the actual application and doesn't affect it (at least that I can determine). Yes, except for performance (a DLL affords within-process communication without the overhead of IPC, so it can be much faster when appropriate) and some technical issues such as threading (if COM client and server are in separate processes, their threading models are independent from each other; if they are in the same process, they'd better have compatible threading approaches -- a thread-unsafe DLL server can make a single-threaded client happy but would cause problems and crashes if a freely-threaded client tried using it). Alex -- http://mail.python.org/mailman/listinfo/python-list
pycurl problem
Hi to all, I have a problem with a snippet of code that creates a Curl object the code is c = pycurl.Curl() c.key = keyCurrent c.proxy = proxyCurrent c.url = http://www.google.; + lg + /search?hl= + lg + q= + c.key + meta=lr%3Dlang_ + lg + num=30 c.setopt(pycurl.URL, c.url) c.setopt(pycurl.PROXY, c.proxy) the last two lines raise a TypeError obviously proxyCurrent, lg and keyCurrent are parameters I noted that if I define c.proxy and c.url as costants e.g. c.url = http://www.google.com/search?blah blah and c.proxy = 127.0.0.1:8080 it works However if I define them as described before pycurl raises the TypeError -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
Steven D'Aprano [EMAIL PROTECTED] wrote: I thought that an iterator was any object that follows the iterator protocol, that is, it has a next() method and an __iter__() method. The special methods need to be on the type -- having attributes of those names on the instance doesn't help (applies to all special methods in the normal, aka newstyle, object model; legacy, aka classic, classes, work by slightly different and not entirely self-consistent semantics). Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: Future Python Gui?
[EMAIL PROTECTED] wrote: I've been trying to find out what the future of Python is with regard to Tk. It seems there are several interfaces that make use of new functionality, including Tile and Ttk. If I want to write a program that will run under the standard Python distribution of the future, what extension module should I work with today? Thanks! -- Brian Tile is available right now in Tk as an extension package, and a Tkinter wrapper for it can be found here: http://tkinter.unpythonic.net/wiki/TileWrapper Tile will be integrated into Tk's core when 8.5 is released. It's supposed to enter beta testing Real Soon Now. However, I imagine that Python/Tkinter will depend on Tk 8.4 for the foreseeable future--certainly 8.5 won't be supported officially before a full, stable release is made. Perhaps in Python 2.6? -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Re: X root Operator help
[Michael Hoffman] In floating point arithmetic, the naive way of calculating both roots always using the formula (-b +/- sqrt(b**2 - 4*a*c))/2*a will give you inaccurate results sometimes. See http://www.cse.uiuc.edu/eot/modules/floating_point/quadratic_formula/. [lucidparadox] Thanks. As of right now I'm just trying to familiarize myself with the syntax of Python. Actually I should have thought of y**(1/x). math.sqrt(y) might be faster or even more accurate (depending on platform) than y**0.5. I'm currently a freshman in college so the alternative formula hasn't been introduced to me yet. It probably won't be unless you take a class in numerical analysis. Many a person has been burned by not thinking about these sorts of things until it is too late (myself included). -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
Combinate 2 lists to a dict ?
Hi all.
I have 2 lists,
a = [1,2,3]
b = [ooo,aaa,ppp]
What is the fastest way to make a dict like {1:ooo,2:aaa,
3:ppp} ?
Thanx
--
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Re: Wanted: Email Client with GUI
On Apr 18, 9:25 am, Franz Steinhaeusler [EMAIL PROTECTED] wrote: What I want is a program (it doesn't have to be so sophisticated as thunderbird) written totally in python and using a gui toolkit like pyqt, pygtk, wxpyhton or tkinter. Why reinvent the wheel? Why not use Mutt and then call any Python script you want from within Mutt. Or use Python modules written for Mutt. See, e.g., http://pyropus.ca/software/ rd -- http://mail.python.org/mailman/listinfo/python-list
Re: Combinate 2 lists to a dict ?
Hi all.
I have 2 lists,
a = [1,2,3]
b = [ooo,aaa,ppp]
What is the fastest way to make a dict like {1:ooo,2:aaa,
3:ppp} ?
Thanx
dict(zip(a,b))
{1: 'ooo', 2: 'aaa', 3: 'ppp'}
works for me, but not sure, if it is the fastest way; a, b have to be of the
same length, otherwise the shorter is used.
vbr
--
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Combinate 2 lists to a dict ?
Hi all.
I have 2 lists,
a = [1,2,3]
b = [ooo,aaa,ppp]
What is the fastest way to make a dict like {1:ooo,2:aaa,
3:ppp} ?
Thanx
--
http://mail.python.org/mailman/listinfo/python-list
subprocess handle is invalid error
I'm trying to use the py-gnuplot module on windows, and have been unable to get it to work reliably under Win2K and WinXP. By default, it uses popen(gnuplotcmd,'w'), but in some situations that consistently gets an invalid operand IOError when write() is called on the pipe. So I switched to subprocess. It works fine when executed normally (e.g. python progname.py), but when bundled by py2exe, it always does this: Traceback (most recent call last): File surfedit.py, line 28, in ? File Gnuplot\_Gnuplot.pyc, line 178, in __init__ File Gnuplot\gp_win32.pyc, line 117, in __init__ File subprocess.pyc, line 533, in __init__ File subprocess.pyc, line 607, in _get_handles File subprocess.pyc, line 634, in _make_inheritable WindowsError: [Errno 6] The handle is invalid How does one troubleshoot errors that happen three layers deep in the subprocess module? -- Grant Edwards grante Yow! I'm a fuschia bowling at ball somewhere in Brittany visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Future Python Gui?
I'd say that the best bet is to learn swig and similar bridging, expanding, and embedding mechanisms. Python GUI programming is likely to involve either python hooking into frameworks like Cocoa, Qt, or wxWidgets, python embedded in frameworks like Java or .NET, or flavors of python used as domain-specific languages in applications such as emacs, vim, and OpenOffice.org. If this were just a tool for me, it wouldn't matter. My concern is distribution. If anybody who wants to run my software then they also have to go through all the trouble to install these extensions, none of which seem to have decent instructions. I'm an old-time hack and I have trouble getting them to work. A simple user won't have a chance! If Python doesn't declare an official Gui system, then it'll be fragmented, inconsistent, and unsupportable. I wouldn't mind using just Tkinter, despite it's primative look, except that it doesn't support more advanced widgets like notebook. -- Brian -- http://mail.python.org/mailman/listinfo/python-list
Re: looking for library to read ppt files
On Apr 18, 4:02 pm, Carsten Haese [EMAIL PROTECTED] wrote: How about running a headless OpenOffice instance and remote-controlling it with pyuno: http://udk.openoffice.org/python/python-bridge.html -Carsten i'll try oo, thanks for link. -- http://mail.python.org/mailman/listinfo/python-list
Re: Combinate 2 lists to a dict ?
Jia Lu wrote: I have 2 lists, a = [1,2,3] b = [ooo,aaa,ppp] reading the documentation might help. If that doesn't work, try d = dict(zip(a, b)) -- http://mail.python.org/mailman/listinfo/python-list
Re: python - dll access (ctypes or swig)
Alex Martelli schrieb: Larry Bates [EMAIL PROTECTED] wrote: ... I guess I was the only one it wasn't obvious to grin. I've always written my COM servers as .EXE files even though they cannot be run independently. What I find is odd is that I can create a .DLL or an .EXE of my COM server and after I register it, my application doesn't appear to know the difference. The difference seems to be hidden from the actual application and doesn't affect it (at least that I can determine). Yes, except for performance (a DLL affords within-process communication without the overhead of IPC, so it can be much faster when appropriate) and some technical issues such as threading (if COM client and server are in separate processes, their threading models are independent from each other; if they are in the same process, they'd better have compatible threading approaches -- a thread-unsafe DLL server can make a single-threaded client happy but would cause problems and crashes if a freely-threaded client tried using it). I think that the latter problem (incompatible threading models in the same process) are solved by COM apartments - aren't they? Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: Future Python Gui?
[EMAIL PROTECTED] wrote: I'd say that the best bet is to learn swig and similar bridging, expanding, and embedding mechanisms. Python GUI programming is likely to involve either python hooking into frameworks like Cocoa, Qt, or wxWidgets, python embedded in frameworks like Java or .NET, or flavors of python used as domain-specific languages in applications such as emacs, vim, and OpenOffice.org. If this were just a tool for me, it wouldn't matter. My concern is distribution. If anybody who wants to run my software then they also have to go through all the trouble to install these extensions, none of which seem to have decent instructions. I'm an old-time hack and I have trouble getting them to work. A simple user won't have a chance! This is what deployment tools such as py2app or py2exe are for--to wrap all the bits up into a simple package that the end user just installs, without worrying about dependencies. -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
I find myself perplexed as to this behaviour. You can not iterate over a dead object! -- http://mail.python.org/mailman/listinfo/python-list
Compiling python from soruce vs RPM ?
I have compiled python 2.5 from source i.e. ./configure make make install but when i try to install another package require python, seems it can't regonize python... e.g.. /usr/bin/python is needed by xyz -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess handle is invalid error
Grant Edwards [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] snip stuff about gnu-plot and py2exe problems How does one troubleshoot errors that happen three layers deep in the subprocess module? I think the problem is more likely in how your py2exe is getting bundled, rather than any real problem with the subprocess module. I have been on the py2exe email list but not really paying much attention... If I recall correctly, there are some special considerations when using gnuplot with py2exe? I would suggest digging through the py2exe email archives to see if you can locate emails on that subject (one copy of which I believe can be found at: http://sourceforge.net/mailarchive/forum.php?forum_name=py2exe-users), and if that doesn't work, to direct your question to the py2exe users list at: [EMAIL PROTECTED] (I believe the current home page of the py2exe project is at: http://sourceforge.net/projects/py2exe/) Hope that helps, -ej -- http://mail.python.org/mailman/listinfo/python-list
Re: X root Operator help
Michael Hoffman wrote: lucidparadox wrote: I'm currently new to Python and I haven't been able to find the operator/math function to find the square root or even the x root of a number. For square root, use math.sqrt(y) For x root use y**(1/x) [...] 1/3 0 3.14159 ** (1/3) 1.0 So the cube root of pi is 1? I don't think so. For generic roots use y ** (1.0 / x) until future versions of Python produce floating point results from all divisions as necessary. regards Steve -- Steve Holden +44 150 684 7255 +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
Newbie: import
I thought import used relative paths from either the python executable or the script being executed. I have a script pulling in code from an arbitrary directory. How is this happening? It's a RHEL 4 environment by the way. I couldn't find any relevant environment variables. Thanks from a newbie for any insight. -- http://mail.python.org/mailman/listinfo/python-list
Re: array{uint32}
Daniel Nogradi [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
I have a function that returns a array{uint32}, is there any way to
output
that to screen in a more user friendly format? At the moment when I
print it
by itself it appears as [65541L], which isn't much used to anyone.
I'm not sure I understand your question precisely but this might help:
mylist = [65541L]
mylist
[65541L]
mylist[0]
65541L
int(mylist[0])
65541
Right, so getting rid of the 'L' is one improvement. You might also check
out the pprint module:
l = range(30)
l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 2
2, 23, 24, 25, 26, 27, 28, 29]
from pprint import pprint
pprint(l)
[0,
1,
2,
3,
snip
28,
29]
You can use C-like print formatting statements:
l = [-3, 0, 101320, 67]
pprint(l)
[-3, 0, 101320, 67]
for i in l:
... print i
...
-3
0
101320
67
for i in l:
... print '%6i' % i
...
-3
0
101320
67
# the above probably doesn't disply correctly unless you are viewing with a
monospaced font)
You could sort the list, then split it up into N separate lists so that
you can format multiple columns of sorted integers...
You haven't given any real information about your idea of a user friendly
format, but maybe this will help also.
-ej
--
http://mail.python.org/mailman/listinfo/python-list
Re: What makes an iterator an iterator?
On Apr 18, 10:36 am, [EMAIL PROTECTED] wrote: I find myself perplexed as to this behaviour. You can not iterate over a dead object! It's not dead, it's restin'. All shagged out over a long squak. -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie: import
[EMAIL PROTECTED] wrote: I thought import used relative paths from either the python executable or the script being executed. I have a script pulling in code from an arbitrary directory. How is this happening? It's a RHEL 4 environment by the way. I couldn't find any relevant environment variables. Thanks from a newbie for any insight. PYTHONPATH environment variable is next in line to be searched. -Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie: import
[EMAIL PROTECTED] wrote: I thought import used relative paths from either the python executable or the script being executed. I have a script pulling in code from an arbitrary directory. How is this happening? It's a RHEL 4 environment by the way. I couldn't find any relevant environment variables. Thanks from a newbie for any insight. See http://docs.python.org/tut/node8.html#SECTION00811 6.1.1 The Module Search Path When a module named spam is imported, the interpreter searches for a file named spam.py in the current directory, and then in the list of directories specified by the environment variable PYTHONPATH. This has the same syntax as the shell variable PATH, that is, a list of directory names. When PYTHONPATH is not set, or when the file is not found there, the search continues in an installation-dependent default path; on Unix, this is usually .:/usr/local/lib/python. Actually, modules are searched in the list of directories given by the variable |sys.path| which is initialized from the directory containing the input script (or the current directory), PYTHONPATH and the installation-dependent default. This allows Python programs that know what they're doing to modify or replace the module search path. Note that because the directory containing the script being run is on the search path, it is important that the script not have the same name as a standard module, or Python will attempt to load the script as a module when that module is imported. This will generally be an error. See section 6.2 http://docs.python.org/tut/node8.html#standardModules, ``Standard Modules,'' for more information. Then try import sys sys.path -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess handle is invalid error
On 2007-04-18, Erik Johnson [EMAIL PROTECTED] wrote: Grant Edwards [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] snip stuff about gnu-plot and py2exe problems How does one troubleshoot errors that happen three layers deep in the subprocess module? I think the problem is more likely in how your py2exe is getting bundled, rather than any real problem with the subprocess module. I've switched back to os.popen() since I seem to get the same problems with either. The odd thing is that it only seems to fail when the current directory is mounted via the network _and_ when it's being started by clicking on a file whose filetype is associated with the application. Running the program from the command line (cmd.exe or bash) always works for any current directory. Running the program by cliking on a shortcut icon on the desktop always works for any 'start in' directory. The one case that doesn't work is when its run by clicking on an associated file on a network drive. -- Grant Edwards grante Yow! Now I'm concentrating at on a specific tank battle visi.comtoward the end of World War II! -- http://mail.python.org/mailman/listinfo/python-list
Martel Package from Biopython
Hello, I know this is not the best place to ask this but I haven't had luck in the Biopython forums with my questions, so I'll just try here. I want to use the Martel package to do some parsing. I've found it to be very powerful and convenient. Yet the documentation avaialble is less than complete. I have a few questions on how to use it, if you know the answers to my questions: - How does Bio.Std.record affect the parsing of a Martel expression. - How does Bio.RecordReader work? How does it interact with Martel.HeaderFooter? - Many of the matching objects (ie. Martel.Digits) have an attrs argument. How does it work? Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: X root Operator help
[Michael Hoffman] For x root use y**(1/x) [Steve Holden] 3.14159 ** (1/3) 1.0 So the cube root of pi is 1? I don't think so. For generic roots use y ** (1.0 / x) Yes, good point. :) -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
image sequence to Quicktime movie
did u ever find anything out about this ? if so can you help me with some leads i am trying to figure an action that can convert image files to quicktime automatically. cheers simon -- http://mail.python.org/mailman/listinfo/python-list
