ANN: pyftpdlib 0.1.1
Changed in version 0.1.1 == * port selection on PASV command has been randomized (this to prevent a remote user to know how many data connections are in progress on the server). * fixed bug in demo/unix_ftpd.py script. * ftpd automatically re-use address if current system is unix. * license changed into a MIT style one. About = pyftpdlib is an high-level FTP server library based on asyncore/ asychat frameworks. pyftpdlib is actually the most complete RFC959 FTP server implementation available for Python programming language. Requirements == Python 2.2 or higher Bug reports / Contacts billiejoex -_[AT]_- gmail (dot) com -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
ANN: pinder 0.5.0
Pinder is a straightforward API to interface with Campfire http://
www.campfirenow.com, the web chat application from 37Signals.
Pinder allows you to create rooms, delete them, speak from a remote
client and more. For example:
room = campfire.find_room_by_name('Jonz Room')
print room.users()
set([u'Alice'])
or
print campfire.users()
set([u'Alice', u'Bob'])
which gets the list of the users talking in each room of the
subdomain.
room.speak(Foobar)
will send the message to the chat room so you can speak too.
There's more like creating and deleting rooms, toggling guest access,
locking the room etc.
See the usage documentation http://dev.oluyede.org/pinder/doc.html
and the API documentation http://dev.oluyede.org/pinder/api/ for
details.
You can install the latest release with:
$ easy_install pinder
or
download from here: http://dev.oluyede.org/download/pinder/
This is the first public release.
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Support the Python Software Foundation:
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Re: Any module to parse httpd.conf?
On 6 Mar 2007 02:03:33 -0800, Gerard Flanagan [EMAIL PROTECTED] wrote: Hello, Does anyone know of an existing module to parse httpd.conf files? Thanks. Jeff McNeil [EMAIL PROTECTED] wrote: I looked at http://www.python.org/pypi/httpdrun not so long ago, itmight be able to do what you want. I think it was a bit hard to read.Remember that with Apache you (may) also need to worry aboutconfiguration merges and whatnot (Directory, VirtualHost, .htaccess, and so on...). What specifically do you want to do? There are a lot of ways to do a lot of things with Apache. If you're looking to create virtual hosts, take a look at mod_vhost_alias or some RewriteRule magic. You're configuration could be pretty simplified and reduced to updating a gdbm file or creating a directory? Jeff Thanks Jeff, At the minute I'm creating a httpd.conf from a template, but at some point the procedure will be completely automated and I may need to merge a generated httpd.conf with an existing one. (This is IHS but I'm told it's identical to Apache as far as httpd.conf is concerned). I don't know where gdbm fits in but I'll look into it. Thanks for the reply. Gerard - New Yahoo! Mail is the ultimate force in competitive emailing. Find out more at the Yahoo! Mail Championships. Plus: play games and win prizes.-- http://mail.python.org/mailman/listinfo/python-list
Re: How to check whether file is open or not
Ros wrote: There are 10 files in the folder. I wish to process all the files one by one. But if the files are open or some processing is going on them then I do not want to disturb that process. In that case I would ignore processing that particular file and move to next file. How can I check whether the file is open or not? I tried os.stat and os.access but I am not getting the expected results. Also I checked in IO exceptions, IO error handler doesnt raise any error if the file is open. There are some options to check but they are platform dependent (works only with unix) You can't do that, at least not in a platform agnostic way, and usually not without cooperation of the file-modifying processes. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check whether file is open or not
En Wed, 07 Mar 2007 02:28:33 -0300, Ros [EMAIL PROTECTED] escribió: There are 10 files in the folder. I wish to process all the files one by one. But if the files are open or some processing is going on them then I do not want to disturb that process. In that case I would ignore processing that particular file and move to next file. How can I check whether the file is open or not? I tried os.stat and os.access but I am not getting the expected results. Also I checked in IO exceptions, IO error handler doesnt raise any error if the file is open. There are some options to check but they are platform dependent (works only with unix) This works only on Windows: You can use the _sopen function (from the C runtime library), which takes additional flags for specifying file sharing. See http://msdn2.microsoft.com/en-us/library/aa273350(VS.60).aspx _sopen with _SH_DENYRW will fail if the file is already open by the same or another process. Try to open the file using this flag: if _sopen succeeds (does not return -1) the file was not already open (remember to close it as soon as possible!); if _sopen fails (returns -1) it was already open. Using the ctypes module (included with Python 2.5; you can download and install it for previous versions) you can call that function easily: py from ctypes import * py crt = cdll.msvcrt py _sopen = crt._sopen py _sopen.argtypes = (c_char_p, c_int, c_int, c_int) py _SH_DENYRW = 0x10 # from share.h py h = _sopen(C:\\1.txt, 0, _SH_DENYRW, 0) py h 3 py h2 = _sopen(C:\\1.txt, 0, _SH_DENYRW, 0) py h2 -1 py _close = crt._close py _close(h) 0 py h2 = _sopen(C:\\1.txt, 0, _SH_DENYRW, 0) py h2 3 py _close(h2) 0 Note: You said But if the files are open or some processing is going on them then I do not want to disturb that process.. There exist a (small) risk of disturbing the other process: if it tries to open the file just after you opened it, but before you close it, the operation will fail. It is a tiny window, but might happen... Surely there are other ways - some programs can report all processes having a certain file opened, by example, but I don't know how to do that. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Device Drivers in python(kernel modules)
John Nagle a écrit : Thomas Ploch wrote: rishi pathak schrieb: I am not much of a kernel programmer , I have a requirement to shift a python code to work as a kernel module. So I was just wondering whether we can write a kernel module in python. A thought is that if we can somehow convert python code into a C object code then it can be done. Can some one suggest something..anything 3. This is probably a bad idea. If it doesn't have to go in the operating system kernel, it shouldn't go in the kernel. John Nagle I agree. If (under Linux) this is just to provide a driver-like interface (ie. using file-system objects manipulation), OP may take a look at FUSE (Filesystem in Userspace - http://fuse.sourceforge.net/) and its Python binding (http://www.google.fr/search?q=FUSE+%2B+Python). -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check whether file is open or not
Ros wrote: There are 10 files in the folder. I wish to process all the files one by one. But if the files are open or some processing is going on them then I do not want to disturb that process. In that case I would ignore processing that particular file and move to next file. How can I check whether the file is open or not? snip From what I know: You can't, in a platform independent way. You'd still be in trouble even if python would let you write something like: if file_is_open(filename): process_file(filename) There's nothing that says no one will open the file after the file_is_open call but before the process_file call. Also, the file might be opened during the processing. If the files to be processed only are written and then closed without being reopened or modified, then your situation is a bit simpler. If you can get the process that creates the files to cooperate, a common way to solve this problem is to have a temporary suffix on files while they are being created. Once the file is complete, the temporary suffix is removed and that signals to other processes that this file is ready for processing. -- http://mail.python.org/mailman/listinfo/python-list
distutils: tweaking my ini to use relevant data_files path
I would like to let my setup script know if the user has provided a
custom path for the data_files of my distribution, e.g. by using the
--install-data option, so the setup can automagically change a config
information in my package to the local path applied, instead of using
some default path I hard-coded into the config information. I could not
find an appropriate pattern for this, but I'm rather confident that this
is not too exotic and some of you already use such a pattern. Would be
great to learn. Thank you in advance.
Following some details. My development version is Python 2.4.4 on
Windows XP. My project contains a sdk.ini configuration file which is in
the root package of my tool (by default in site-packages of course).
This INI has a OSPDIR option for a path to some example *.osp files
(data_files) coming with the distribution. These *.osp files are some
work files that should be typically stored in an user's home directory
or somewhere else, but not in the Python directory.
So, the setup() in my setup.py has (among many other arguments, which I
don't consier to be important for my task here):
data_files=[('projects', ['projects/foo.osp', 'projects/bar.osp']),
By default this projects directory is going into the Python directory,
right? At least I could see that in my Python 2.4.4 installation on
Windows XP:
C:\Python24\projects\
My default config could be:
OSPDIR = os.path.join(sys.prefix, 'projects')
so, my tool should usually know where this directory is on a local machine.
But, as mentioned earlier, it makes much sense to have projects (and
its contained data files) installed instead to another location, e.g.
user home or D:\ etc. - of course this should work on any platform with
Python and distutils.
I already learned, that user's can alter where setup distributes
specific parts, such as the data_files with the --install-data option,
see alternate installation
http://www.python.org/doc/2.4.4/inst/alt-install-windows.html
or custom installation http://www.python.org/doc/2.4.4/inst/search-path.html
I think, this is reasonable for any user. But what do I need to do, to
provide OSPDIR with this particular --install-data path applied by the
user? Can I use OptionParser module (as I already do for my tools) in
the setup.py which checks, if this option is given, and eventually which
value it has, and somehow putting it dynamically into the OSPDIR variable?
a) Is --install-data the only way for users to customize path to data_files?
b) Am I right to parse --install-data in setup.py and change OSPDIR
variable on the fly?
c) If yes, how do I add this to my setup.py? It currently has only a
setup() call with plenty of arguments (no weired stuff, though). Do I
need to put this verifcation before or after setup() or is there any
callback or hook to use?
Many thanks for your support,
Anastasios
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Re: askstring Window to the top under Windows
On 7 Mrz., 02:49, jim-on-linux [EMAIL PROTECTED] wrote: On Tuesday 06 March 2007 08:13, iwl wrote: Hi, I tryed askstring to input some text in my script, but some ugly empty Window appears with the Input-Window behind and all together behind my Console showing my script. So all have to brought to the top first by the user - very unconfortable By default tk will open a root window. Is this default changeable befor askstring? -- http://mail.python.org/mailman/listinfo/python-list
Re: audio video streaming communications
Hi Ken, I am looking for something similar. I can do the communications myself but need to be able to select a video feed, capture it and also need to display it through wxPython. Trawled the web and even tried to hire coders to create it for me. So far I have been having no luck. I did learn that fastaudio is a good way to bluescreen a WinXP box ;-) Have you found something? Paul Ken Seehart wrote: Hello, I am looking for a good audio/video conferencing library. Ideally it should work with wxPython (or have some means of making it work there). So far my main difficulty in my attempt at searching for such a package is that there is so much stuff out there on downloading music and videos. I am not interested in download torrents, etc. I'm just looking video conferencing, and live video broadcasts, etc. Any recommendations? Thanks, - Ken -- http://mail.python.org/mailman/listinfo/python-list
finding monitor or screen resolution in Linux with standard python module
I googled and searched in archive. All I can find is finding resolution with Tkinter and pygame. Any idea to find monitor resolution with standard python module? I can check from output of: xprop -root _NET_DESKTOP_GEOMETRY(CARDINAL) . The problem is when you use Beryl or Xgl, it is not correct anymore because Beryl or Xgl set this value from amount of workspaces multiplied by monitor or screen resolution. -- http://mail.python.org/mailman/listinfo/python-list
How to build a Windows service using win32?
I'm trying to write a Win32 service. The following is straight from Python
Programming on Win32 and it doesn't work. Is that book out of date; is
there a new way to do services? I searched Google for hours trying to find
any other method, and have been beating on this one for 5 more hours.
The present error is:
C:\Testerpython tester.py debug
Debugging service Tester - press Ctrl+C to stop.
Error 0xC004 - Python could not import the service's module
type 'exceptions.ImportError': No module named service
The code is:
import win32serviceutil, win32service, win32event
class Service(win32serviceutil.ServiceFramework):
_svc_name_ = EDMS-to-CG
_svc_display_name_ = EDMS-to-CG Syncer
_svc_description_ = Uploaded the EDMS database to Cartograph
def __init__(self, args):
win32serviceutil.ServiceFramework.__init__(self, args)
self.hWaitStop = win32event.CreateEvent(None, 0, 0, None)
def SvcStop(self):
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
win32event.SetEvent(self.hWaitStop)
def SvcDoRun(self):
pausetime = 60 * 1000
while True:
stopsignal = win32event.WaitForSingleObject(self.hWaitStop,
pausetime)
if stopsignal == win32event.WAIT_OBJECT_0: break
self.runOneLoop()
def runOneLoop(self):
import servicemanager
servicemanager.LogInfoMsg('Running')
win32serviceutil.HandleCommandLine(Service)
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Re: Recommended FastCGI module?
In article [EMAIL PROTECTED], John Nagle wrote: The JonPy version: http://jonpy.sourceforge.net/fcgi.html Last revised in 2004. I'd recommend my one, but it's just possible I'm not impartial ;-) -- http://mail.python.org/mailman/listinfo/python-list
Re: How to build a Windows service using win32?
En Wed, 07 Mar 2007 07:25:56 -0300, Gregor Mosheh [EMAIL PROTECTED] escribió: I'm trying to write a Win32 service. The following is straight from Python Programming on Win32 and it doesn't work. Is that book out of date; is there a new way to do services? I searched Google for hours trying to find any other method, and have been beating on this one for 5 more hours. Have you installed the pywin32 package from https://sourceforge.net/projects/pywin32/ ? The code skeleton looks OK to me. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
thread and portability Unix/Linux
Hi, I have a Python application that runs under HPUX 11.11 (then unix). It uses threads : from threading import Thread # Class Main class RunComponent(Thread): My application should run under Linux (red hat 3 ou 4) and I read that differences exist between the implementation of threads : on HPUX 11.11 there is CMA (ou DCE) threads and on Linux POSIX thread. Do you think that my Python application should be modified or may be such differences are hidden by the python interpreter ? In other terms, do I get some risks on this particular aspect by porting my application ? Thanks a lot PS: If you are aware of other risk of porting, I am interested too. -- http://mail.python.org/mailman/listinfo/python-list
Pb with __del__ and inheritence
Hello all, Can someone reproduce this bug ... I use : [EMAIL PROTECTED] /home/adam/Work/Python] python Python 2.4.3 (#2, Sep 18 2006, 21:07:35) [GCC 4.1.1 20060724 (prerelease) (4.1.1-3mdk)] on linux2 Type help, copyright, credits or license for more information. First test : [EMAIL PROTECTED] /home/adam/Work/Python] cat bug_del.py echo -- python bug_del.py class XObject(object): def __del__(self): print XObject.__del__ return pass class A(XObject): def __del__(self): print A.__del__ XObject.__del__(self) return pass a = A() -- A.__del__ XObject.__del__ [EMAIL PROTECTED] /home/adam/Work/Python] Everything is ok ... now I just replace a = A() by aaa = A(): [EMAIL PROTECTED] /home/adam/Work/Python] cat bug_del.py echo -- python bug_del.py class XObject(object): def __del__(self): print XObject.__del__ return pass class A(XObject): def __del__(self): print A.__del__ XObject.__del__(self) return pass aaa = A() -- A.__del__ Exception exceptions.AttributeError: 'NoneType' object has no attribute '__del__' in bound method A.__del__ of __main__.A object at 0xb7bb124c ignored [EMAIL PROTECTED] /home/adam/Work/Python] !!! Thanks in advance, E.A. -- http://mail.python.org/mailman/listinfo/python-list
Re: Pb with __del__ and inheritence
En Wed, 07 Mar 2007 07:35:05 -0300, Erwan Adam [EMAIL PROTECTED] escribió: Can someone reproduce this bug ... I use : Same on 2.5 Windows. class XObject(object): def __del__(self): print XObject.__del__ return pass class A(XObject): def __del__(self): print A.__del__ XObject.__del__(self) return pass aaa = A() -- A.__del__ Exception exceptions.AttributeError: 'NoneType' object has no attribute '__del__' in bound method A.__del__ of __main__.A object at 0xb7bb124c ignored Print XObject inside A.__del__ and you can see that it is None. That means that the XObject reference was set to None *before* aaa was deleted. Values inside the module namespace are set to None when it's destroyed (to break possible reference cycles, I presume). I can't find any place in the docs that guarantees any ordering on the object deletion, so I don't consider this a bug. See the big notes on the __del__ method docs. If you *really* must do some cleanup on A.__del__, you can't trust on *any* globals, and you must store a reference to anything needed inside __del__ -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: re-point mod_python - is it possible?
great explaination - thanks graham! -- http://mail.python.org/mailman/listinfo/python-list
Re: PyQt4: Clickable links in QLabel?
David Boddie wrote: On Thursday 01 March 2007 09:00, Tina I wrote: A short and sweet question: Is it possible to put a clickable link in a QLabel that will open in the systems default browser? Yes. I tried to put in some HTML but it did (of course?) simply display the code instead of a link. I also tried to set openExternalLinks 'true' but then pyuic4 bombed. Well, that shouldn't happen. :-( Can you send a bug report to the PyQt mailing list (assuming you're subscribed to it) with the error message or backtrace that you get when this happens? I see that QLabel does not have a html text format but I'm still hoping it's possible. I really need a link on my main window form. If you enclose the HTML with qt and /qt tags, the HTML should be displayed properly. Any other matching tags should also work, so you could use p and /p if you want. Setting the label's openExternalLinks property to True should then enable what you want. You can try this out by previewing the form in Qt Designer. David Thanks David, This is embarrassing... but my PyQt4 was too old *blush* I can't believe I didn't think of double checking what version I had installed. A swift upgrade and it works like a charm :) Tina -- http://mail.python.org/mailman/listinfo/python-list
Re: *** CANADIAN ANTI-TERROR LAW HAS BEEN STRUCK DOWN BY ITS HONORABLE SUPREME COURT UNANIMOUSLY *** (REPOST)
On Feb 24, 11:22 am, [EMAIL PROTECTED] wrote: Canada anti-terror law is struck downFrom the Associated Press February 24, 2007 OTTAWA - Canada's Supreme Court on Friday unanimously declared it unconstitutional to detain foreign terrorism suspects indefinitely while the courts review their deportation orders. Five Arab Muslim men have been held for years under the security certificate program, which the Justice Department has said is a key tool in the fight against global terrorism and essential to Canada's security. The court found that the system violated the Charter of Rights and Freedoms, Canada's bill of rights. However, it suspended its ruling for a year to give Parliament time to rewrite the part of the Immigration and Refugee Protection Act that covers the certificate process. The security certificates were challenged by three men from Morocco, Syria and Algeria - all alleged by the Canadian Security Intelligence Service to have ties to terrorist networks. The men have spent years in jail while fighting deportation orders. They risk being labeled terrorists and sent back to their native countries, where they say they could face torture. The court said the treatment of the suspects was a violation of their rights. The overarching principle of fundamental justice that applies here is this: Before the state can detain people for significant periods of time, it must accord them a fair judicial process, Chief Justice Beverley McLachlin wrote in a ruling for all nine justices. The secrecy required by the scheme denies the person named in a certificate the opportunity to know the case put against him or her, and hence to challenge the government's case, she said. The challenged law allows sensitive intelligence to be heard behind closed doors by a federal judge, with only sketchy summaries given to defense attorneys. The court said the men and their lawyers should have a right to respond to the evidence used against them by intelligence agents. Stockwell Day, the minister of public safety, noted that because the ruling does not take effect for a year, the certificates would remain in place. He said the government would address the court's ruling in a timely and decisive fashion. Two of the men are out on bail and remain under house arrest. Three others are being held in a federal facility in Ontario. The court said the treatment of the suspects was a violation of their rights. The overarching principle of fundamental justice that applies here is this: Before the state can detain people for significant periods of time, it must accord them a fair judicial process, Chief Justice Beverley McLachlin wrote in a ruling for all nine justices. The secrecy required by the scheme denies the person named in a certificate the opportunity to know the case put against him or her, and hence to challenge the government's case, she said. THAT IS CALLED PROTECTING CIVIL RIGHTS. IN THE UNITED STATES OF AMERICA, WHERE CIVIL RIGHTS ARE PROTECTED BY LAW, FOREIGN SUSPECTS ARE NOT PROTECTED BY THE GENEVA CONVENTION. DR. EVIL, V.P. CHENEY, AND MINI-ME, PRESIDENT BUSH, OPTED TO MODIFY THE GENEVA CONVENTION TO DENY FOREIGN SUSPECTS DUE PROCESS DEMANDED BY THE CONVENTION. THIS MEANS ENEMIES OF THE UNITED STATES OF AMERICA WILL BE DOING JUST THAT TOO. WHAT IS GOOD FOR THE GOOSE IS GOOD FOR GANDER. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to build a Windows service using win32?
On 7 Mar, 10:25, Gregor Mosheh [EMAIL PROTECTED] wrote:
I'm trying to write a Win32 service. The following is straight from Python
Programming on Win32 and it doesn't work. Is that book out of date; is
there a new way to do services? I searched Google for hours trying to find
any other method, and have been beating on this one for 5 more hours.
The present error is:
C:\Testerpython tester.py debug
Debugging service Tester - press Ctrl+C to stop.
Error 0xC004 - Python could not import the service's module
type 'exceptions.ImportError': No module named service
The code is:
import win32serviceutil, win32service, win32event
class Service(win32serviceutil.ServiceFramework):
_svc_name_ = EDMS-to-CG
_svc_display_name_ = EDMS-to-CG Syncer
_svc_description_ = Uploaded the EDMS database to Cartograph
def __init__(self, args):
win32serviceutil.ServiceFramework.__init__(self, args)
self.hWaitStop = win32event.CreateEvent(None, 0, 0, None)
def SvcStop(self):
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
win32event.SetEvent(self.hWaitStop)
def SvcDoRun(self):
pausetime = 60 * 1000
while True:
stopsignal = win32event.WaitForSingleObject(self.hWaitStop,
pausetime)
if stopsignal == win32event.WAIT_OBJECT_0: break
self.runOneLoop()
def runOneLoop(self):
import servicemanager
servicemanager.LogInfoMsg('Running')
win32serviceutil.HandleCommandLine(Service)
Yeah. You've cleverly decided to simplify the smallest possible
python service by removing the
if __name__ == '__main__':
bit from the script ;)
Try adding it back it. It worked for me.
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Re: Python Source Code Beautifier
Il Tue, 06 Mar 2007 01:55:54 -0300, Gabriel Genellina ha scritto: The problem is that other people -not necesarily smarter and more experienced than you- may use those features, and perhaps you have to read, understand and modify some code written by someone else. So, you should at least know what a += b means, even if you are not going to use it. That's sure, and I'm in fact glad to know that by now. I still think it's risky, BTW. Python is dynamically typed, after all, and there's no 'a priori' way to know if 'a' is a list or another type, especially another container type. If we rely on duck typing, by the way, we may encounter two types quacking like ducks, flying like ducks, but in fact acting as slightly different ducks. I should remember as well, when designing a container type that I want to use in place of a list, to carefully craft an __iadd__ method which works just like the a list's own __iadd__ method; if I forget, I may introduce a subtle error. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
distutils - how to get more flexible configuration
Hello I'm writing a package that has cgi-bin scripts, html files and data files (templates used by cgi scripts). I find that using distutils in the standard way does not give me enough flexibilty, even if I use a setup.cfg. For example, I want certain data files to go to markedly different locations. However, I have come up with a solution, that looks like it will work for me, and I'd welcome comments. Here's the MANIFEST file === setup.py myproj_cfg.py data/wibble.txt data/wobble.txt === And here's the setup.py file I've written === from distutils.core import setup import myproj_cfg data_files = [ (myproj_cfg.wibble, ['data/wibble.txt']), (myproj_cfg.wobble, ['data/wobble.txt']), ] setup(data_files=data_files) === The user is asked to create a myproj_cfg.py file, which might look like === wibble = '/wibble' wobble = '/wobble' === And when a distribution is created and installed we get === $ python setup.py install running install running build running install_data creating /wibble copying data/wibble.txt - /wibble creating /wobble copying data/wobble.txt - /wobble === This is an example of what I want. I'd welcome your comments. -- Jonathan Fine The Open University, Milton Keynes, England -- http://mail.python.org/mailman/listinfo/python-list
Re: Why does SocketServer default allow_reuse_address = false?
On Feb 26, 5:54 pm, Joshua J. Kugler [EMAIL PROTECTED] wrote: Considering that UNIX Network Programming, Vol 1 (by W. Richard Stevens) recommends _All_ TCP servers should specify [SO_REUSEADDR] to allow the server to be restarted [if there are clients connected], and that self.allow_reuse_address = False makes restarting a server a pain if there were connected clients, why does SocketServer default allow_reuse_address to False? It's kind of bemusing to subclass ThreadingTCPServer just to change one variable that arguably should have been True in the first place. Is there some history to this of which I'm not aware? Is there a good reason for it to default to false? Yes, it is there for a good reason. Security is the primary focus of that option. If you enable that option, rogue applications can assume service processing under a number of server failure conditions. In other words, start your rogue, crash the primary service, and you now have a rogue service running. Even periodic checks will show the server is still running. Under a number of other configurations, it is also possible for the rogue service to simply start and usurp some types of IP traffic on certain OSs which would otherwise be delivered to your real server. Contrary to the book, blindly enabling SO_REUSEADDR is a very, very bad idea unless you completely understand the problem domain. I'm sure Stevens' does understand so it makes for a good choice for him. On the other hand, most people don't understand the implications so it makes for a very, very poor move from a security perspective. Long story short, it is not a bug. It is a feature. The proper default is that of the OS, which is to ensure SO_REUSEADDR is disabled unless you absoluetely understand what you're buying by enabling it. Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: askstring Window to the top under Windows
On Wednesday 07 March 2007 05:05, iwl wrote: On 7 Mrz., 02:49, jim-on-linux [EMAIL PROTECTED] wrote: On Tuesday 06 March 2007 08:13, iwl wrote: Hi, I tryed askstring to input some text in my script, but some ugly empty Window appears with the Input-Window behind and all together behind my Console showing my script. So all have to brought to the top first by the user - very unconfortable By default tk will open a root window. Is this default changeable befor askstring? Here is an example of a simple button that will open a tkSimpleDialog box == from Tkinter import * import tkSimpleDialog from tkSimpleDialog import askfloat root = Tk() ## this is the default window vlab = Button( root, text= 'Click here to Open Dialog', width = 20, height = 2, bg = 'yellow', command =(lambda: askfloat( 'Entery', 'Enter credit card number') ) ) vlab.grid() mainloop() jim-on-linux http://www.inqvista.com -- http://mail.python.org/mailman/listinfo/python-list
Tkinter menu
hi i have create widget with menu bar and menus on it. when i resize my widget to less than menubar is than from right to left menus on menubar goes to second row. who to disable that? all I want is that when i resize my widget to less size, that menus on menubar stays on default position . thanks i advance -- http://mail.python.org/mailman/listinfo/python-list
Generator expression parenthesis mixed with function call ones
[Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32] Given the following: sum(i for i in range(10)) 45 def f(*args) : print args ... f(i for i in range(10)) (generator object at 0x00A79788,) def f(a,*args) : print a,ar ... f(4,i for i in range(10)) File stdin, line 1 SyntaxError: invalid syntax Why does Python allow generator expression parenthesis to be mixed with function call parenthesis when there is only one parameter ? IMHO this should be forbidden, usage must not be different when there is only one parameter and when there are more parameters. User should all times explicitly use () for a generator expression and [] for a list comprehension expression. -- http://mail.python.org/mailman/listinfo/python-list
Re: finding monitor or screen resolution in Linux with standard python module
I'm using Beryl too, and xwininfo -root gives te correct resolution. akbar wrote: I googled and searched in archive. All I can find is finding resolution with Tkinter and pygame. Any idea to find monitor resolution with standard python module? I can check from output of: xprop -root _NET_DESKTOP_GEOMETRY(CARDINAL) . The problem is when you use Beryl or Xgl, it is not correct anymore because Beryl or Xgl set this value from amount of workspaces multiplied by monitor or screen resolution. NOTA: La informacion de este correo es de propiedad exclusiva y confidencial. Este mensaje es solo para el destinatario indicado, si usted no lo es, destruyalo de inmediato. Ninguna informacion aqui contenida debe ser entendida como dada o avalada por MADISA, sus subsidiarias o sus empleados, salvo cuando ello expresamente se indique. Es responsabilidad de quien recibe este correo de asegurarse que este libre de virus, por lo tanto ni MADISA, sus subsidiarias ni sus empleados aceptan responsabilidad alguna. NOTE: The information in this email is proprietary and confidential. This message is for the designated recipient only, if you are not the intended recipient, you should destroy it immediately. Any information in this message shall not be understood as given or endorsed by MADISA, its subsidiaries or their employees, unless expressly so stated. It is the responsibility of the recipient to ensure that this email is virus free, therefore neither MADISA, its subsidiaries nor their employees accept any responsibility. -- http://mail.python.org/mailman/listinfo/python-list
Re: Generator expression parenthesis mixed with function call ones
Laurent Pointal wrote: f(4,i for i in range(10)) File stdin, line 1 SyntaxError: invalid syntax Why does Python allow generator expression parenthesis to be mixed with function call parenthesis when there is only one parameter ? For simplicity and elegant coding, so you can do something like you did at first: sum(i for i in range(10)) IMHO this should be forbidden, usage must not be different when there is only one parameter and when there are more parameters. The problem in your last test is that if you use more than one argument, you *must* use the parenthesis. In Py2.5 there's a better message error: f(4,i for i in range(10)) File stdin, line 1 SyntaxError: Generator expression must be parenthesized if not sole argument The correct way to do that is: f(4,(i for i in range(10))) 4 (generator object at 0xb7dab56c,) Regards, -- . Facundo . Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/ -- http://mail.python.org/mailman/listinfo/python-list
Re: finding monitor or screen resolution in Linux with standard python module
On Mar 7, 4:25 am, akbar [EMAIL PROTECTED] wrote: I googled and searched in archive. All I can find is finding resolution with Tkinter and pygame. Any idea to find monitor resolution with standard python module? I can check from output of: xprop -root _NET_DESKTOP_GEOMETRY(CARDINAL) . The problem is when you use Beryl or Xgl, it is not correct anymore because Beryl or Xgl set this value from amount of workspaces multiplied by monitor or screen resolution. Perhaps read-edid [1] or ddcprobe [2] would work since they read the info strait off the EDID. You could probably read the EDID from python (mabye through the xlib binding?), but no need to reinvent the wheel. [1] http://john.fremlin.de/programs/linux/read-edid/index.html [2] http://sources.gentoo.org/viewcvs.py/gentoo-src/Xorgautoconfig/ddcprobe/ Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
Re: Generator expression parenthesis mixed with function call ones
En Wed, 07 Mar 2007 12:53:43 -0300, Laurent Pointal [EMAIL PROTECTED] escribió: f(4,i for i in range(10)) File stdin, line 1 SyntaxError: invalid syntax 2.5 has a better error message: py f(4,i for i in range(10)) File stdin, line 1 SyntaxError: Generator expression must be parenthesized if not sole argument Why does Python allow generator expression parenthesis to be mixed with function call parenthesis when there is only one parameter ? Because they are redundant when only one argument is used. sum(i for i in range(10)) looks better than sum((i for i in range(10))) Beautiful is better than ugly, and Readability counts. IMHO this should be forbidden, usage must not be different when there is only one parameter and when there are more parameters. It's similar to %d % 123 vs. %d % (123,) Special cases aren't special enough to break the rules. Although practicality beats purity. User should all times explicitly use () for a generator expression and [] for a list comprehension expression. For a list comprehension, yes. For a generator, not always. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: How to build a Windows service using win32?
Giles Brown wrote:
Yeah. You've cleverly decided to simplify the smallest possible
python service by removing the
if __name__ == '__main__':
Ha ha. :)
Seriously, though, I removed that long after it was failing to work, and
have since replaced it and it didn't affect a thing.
Gabriel Genellina wrote:
Have you installed the pywin32 package from
https://sourceforge.net/projects/pywin32/ ?
The code skeleton looks OK to me.
Indeed, I have win32 installed. I'm used to writing wx applications,
compiling into exes, etc. Services are a new direction for me.
So, both of you say that the program I sent *did* work?import win32serviceutil, win32service, win32event
class Service(win32serviceutil.ServiceFramework):
_svc_name_ = EDMS-to-CG
_svc_display_name_ = EDMS-to-CG Syncer
_svc_description_ = Uploaded the EDMS database to Cartograph
def __init__(self, args):
win32serviceutil.ServiceFramework.__init__(self, args)
self.hWaitStop = win32event.CreateEvent(None, 0, 0, None)
def SvcStop(self):
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
win32event.SetEvent(self.hWaitStop)
def SvcDoRun(self):
pausetime = 60 * 1000
while True:
stopsignal = win32event.WaitForSingleObject(self.hWaitStop,
pausetime)
if stopsignal == win32event.WAIT_OBJECT_0: break
self.runOneLoop()
def runOneLoop(self):
import servicemanager
servicemanager.LogInfoMsg('Running')
if __name__ == '__main__':
win32serviceutil.HandleCommandLine(Service)--
http://mail.python.org/mailman/listinfo/python-list
Re: askstring Window to the top under Windows
On Wednesday 07 March 2007 05:02, Ingo Wolf wrote: Original-Nachricht Datum: Tue, 06 Mar 2007 20:49:42 -0500 Von: jim-on-linux [EMAIL PROTECTED] An: python-list@python.org CC: iwl [EMAIL PROTECTED] Betreff: Re: askstring Window to the top under Windows By default tk will open a root window. so you will have to create something to put into the root window. I suggest a button to open the tkSimpleDialog box. go to; http://www.pythonware.com/library/tkinter/int roduction/ I've allready had a short look trough this to find an idea how to change this behavior (which should be done by the askstring makers) but haven't up to now. I think what I do is what askstring was made for keeping me away from tk internals only wanting a little string input. Because I have embedded python In my C-App I make my own window now In C and extend python by it so having more control about things happen. Check out how to use Entry Wiget for data entry. from Tkinter import * root = Tk() ## this is the default window vlab = Label(root, width = 20, text = 'Enter data here') vlab.grid( row=0, column =0) ventry= Entry(root, width = 30) ventry.grid(row = 0, column = 1) mainloop() jim-on-linux http:\\www.inqvista.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to build a Windows service using win32?
Giles Brown wrote: Yeah. You've cleverly decided to simplify the smallest possible python service by removing the if __name__ == '__main__': Ha ha. :) Seriously, though, I removed that long after it was failing to work, and have since replaced it and it didn't affect a thing. Gabriel Genellina wrote: Have you installed the pywin32 package from https://sourceforge.net/projects/pywin32/ ? The code skeleton looks OK to me. Indeed, I have win32 installed. :) I'm used to writing wxPython apps, even a small-scale video game, but services are a new and alien direction for me. :) Now, I did stumble upon the solution to this one this morning, after a fresh night of sleep: I re-ran python tester.py install I got a message that the service had been updated, and now it runs! Hooray! Any insight into why that would be the case? Does pythonservice.exe keep a cached copy or some such, so I'll have to re-install the service after code changes? -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
En Wed, 07 Mar 2007 10:29:29 -0300, Alan Franzoni [EMAIL PROTECTED] escribió: Il Tue, 06 Mar 2007 01:55:54 -0300, Gabriel Genellina ha scritto: If we rely on duck typing, by the way, we may encounter two types quacking like ducks, flying like ducks, but in fact acting as slightly different ducks. I should remember as well, when designing a container type that I want to use in place of a list, to carefully craft an __iadd__ method which works just like the a list's own __iadd__ method; if I forget, I may introduce a subtle error. I'm not sure of your concerns. If you want to provide your own container that mimics a list, there are a lot more things to consider than __iadd__ (See the UserList class or this ListMixin recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440656). __iadd__, in general, is not *required* to modify the instance in place (but should try to do that, if possible). After this code: b = a a += c you can't assert than a and b both refer to the *same* object, as before. If you need that, don't use += at all. (For a generic object, I mean. The built-in list does the right thing, of course) -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Recommended FastCGI module?
Jon Ribbens wrote: In article [EMAIL PROTECTED], John Nagle wrote: The JonPy version: http://jonpy.sourceforge.net/fcgi.html Last revised in 2004. I'd recommend my one, but it's just possible I'm not impartial ;-) Does it work with current Pythons? (2.4, 2.5)? I'm mainly concerned about the abandonware problem with some of them. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: How to build a Windows service using win32?
En Wed, 07 Mar 2007 13:45:44 -0300, Gregor Mosheh [EMAIL PROTECTED] escribió: Now, I did stumble upon the solution to this one this morning, after a fresh night of sleep: I re-ran python tester.py install I got a message that the service had been updated, and now it runs! Hooray! Any insight into why that would be the case? Does pythonservice.exe keep a cached copy or some such, so I'll have to re-install the service after code changes? I don't think so. After code changes, stopping and restarting the service should be enough. Maybe you had registered another source file, maybe on another directory, using the same service name? -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Recommended FastCGI module?
John Nagle wrote: What's the recommended FastCGI module for Python. There are at least five: The Robin Dunn / Total Control Software version: http://alldunn.com/python/fcgi.py Last revised in 1998. ... we are using a slightly modified and modernized version of the above in a front facing app for a large company with reasonable results. Our decision was prompted by a consultant who wanted more speed, but it turned out the original traffic assumptions were wrong so the small advantage over CGI isn't actually needed. At the back end we're using apache+mod_fastcgi and choosing the configuration parameters was the main difficulty. Using fcgi did induce some fairly careful code consideration to ensure we could rerun without blowing up the universe. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: Recommended FastCGI module?
In article [EMAIL PROTECTED], John Nagle wrote: Jon Ribbens wrote: The JonPy version: http://jonpy.sourceforge.net/fcgi.html Last revised in 2004. I'd recommend my one, but it's just possible I'm not impartial ;-) Does it work with current Pythons? (2.4, 2.5)? I'm mainly concerned about the abandonware problem with some of them. Yes, I use it myself in my day job, where we have recently upgraded to Python 2.5. jonpy itself hasn't been revised for a while because there have been no revisions I felt necessary. There may be a new version released in the next couple of months, but there won't be any major changes. -- http://mail.python.org/mailman/listinfo/python-list
Re: Project organization and import
package_name/ package_pre.py - contains globals for the package component_a.py- a useful-sized collection of functionality component_b.py- another component_c.py- another package_post.py - stuff that relies on the prior stuff __init__.py - or you can put the post stuff here Then __init__.py contains something like: from package_pre import * from component_a import * from component_b import * from component_c import * from package_post import * Anansi Spaceworkshttp://www.AnansiSpaceworks.com Thank you! That is by far the clearest I have ever seen that explained. I saved it and Sent it on to a friend that is learning python. -- http://mail.python.org/mailman/listinfo/python-list
Re: Generator expression parenthesis mixed with function call ones
Gabriel Genellina wrote: En Wed, 07 Mar 2007 12:53:43 -0300, Laurent Pointal [EMAIL PROTECTED] escribió: f(4,i for i in range(10)) File stdin, line 1 SyntaxError: invalid syntax 2.5 has a better error message: py f(4,i for i in range(10)) File stdin, line 1 SyntaxError: Generator expression must be parenthesized if not sole argument Why does Python allow generator expression parenthesis to be mixed with function call parenthesis when there is only one parameter ? Because they are redundant when only one argument is used. sum(i for i in range(10)) looks better than sum((i for i in range(10))) Beautiful is better than ugly, and Readability counts. I complement my reply. Beginners generally know about list-comprehensions and associate the syntax x for x in asequence to a list expression. I'm not sure that reading a f(i for i in range(20)) they understand that they are dealing with a different object kind. If function f start by a if len(myparameter)... TypeError: len() of unsized object If function f goes among its parameter with for x in myparameter more than once, other loops goes throught an empty loop. IMHO this should be forbidden, usage must not be different when there is only one parameter and when there are more parameters. It's similar to %d % 123 vs. %d % (123,) Special cases aren't special enough to break the rules. Although practicality beats purity. In that case there cannot be confusion. A+ Laurent. -- http://mail.python.org/mailman/listinfo/python-list
catching exceptions from an except: block
Hi all, Imagine I have three functions a(x), b(x), c(x) that each return something or raise an exception. Imagine I want to define a function that returns a(x) if possible, otherwise b(x), otherwise c(x), otherwise raise CantDoIt. Here are three ways I can think of doing it: -- # This one looks ugly def nested_first(x): try: return a(x) except: try: return b(x) except: try: return c(x) except: raise CantDoIt # This one looks long-winded def flat_first(x): try: return a(x) except: pass try: return b(x) except: pass try: return c(x) except: raise CantDoIt # This one only works because a,b,c are functions # Moreover it seems like an abuse of a loop construct to me def rolled_first(x): for f in a, b, c: try: return f(x) except: continue raise CantDoIt -- I don't feel happy with any of these. Is there a more satisfying way of doing this in Python? What I would like is something like: -- # This one isn't correct but looks the clearest to me def wished_first(x): try: return a(x) except: return b(x) except: return c(x) except: raise CantDoIt -- I guess what I'm looking for is some sort of if: elif: ... elif: else: but for try: except: That's why try: except: except: ... except: seemed natural to me :) And I'd like to find a nice way to do this in a syntactically correct way. Note: I've chosen functions a, b, c, but really I'm looking for a way that is suitable for any chunk of code. -- http://mail.python.org/mailman/listinfo/python-list
Re: persistent fifo queue class
Diez B. Roggisch wrote: David Bear schrieb: I'm looking to see if there are any examples or prewritting fifo queue classes. I know this is a broad topic. I'm looking to implement a simple application where a web server enqueue and pickle using a local socket on to a 'queue server' -- and then I will have another application dequeue the pickles again using a local socket. Why don't you use a DB for that? If you want pickles, use a blob column. But all the rest - a defined protocol, stable server, transactions - you get for free. Diez Thanks for the suggestion. I did think of this. Indeed the final destination of the data is in a db. However, the postsgresql server is on a separate box. It will be connected via a private lan. I was worried that possible network disruptions would cause either the web application to hang -- or data to just get lost. I was thinking along the lines is a message queue architecture, where the web app would push data directly onto a queue -- and then a worker app would dequeue the data and handle it by sending it to the db server or otherwise. -- David Bear -- let me buy your intellectual property, I want to own your thoughts -- -- http://mail.python.org/mailman/listinfo/python-list
Debugging segmentation faults
I have a pure python program (no C extensions) that occasionally core dumps in a non-reproducible way. The program is started by a (non- python) cgi script when a form is submitted. It involves running a bunch of other programs through subprocess in multiple threads and writing its output in several files. So the only suspicious parts I can think of is subprocess and/or multithreading. For the multithreading part I'm using a modified version of threadpool.py (http://www.chrisarndt.de/en/software/python/threadpool/), which is built on top of the threading and Queue stdlib modules. Whatever bugs may linger there, I'd hope that they would show up as normal Python exceptions instead of segfaults. All I have now is a few not particularly insightful core files (actual path names and args changed for privacy): /home/gsakkis/foogdb --core core.20140 GNU gdb Red Hat Linux (5.2-2) Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type show copying to see the conditions. There is absolutely no warranty for GDB. Type show warranty for details. This GDB was configured as i386-redhat-linux. Core was generated by `python2.5 /home/gsakkis/foo/foo.py --XXX -- max=30 --bar=/tmp/83840` Program terminated with signal 11, Segmentation fault. #0 0x080b222d in ?? () (gdb) backtrace #0 0x080b222d in ?? () #1 0x080b28d1 in ?? () #2 0x080fa8ab in ?? () #3 0x0805c918 in ?? () (...) #28 0x080b310f in ?? () #29 0x080dbfdd in ?? () #30 0x40021fef in ?? () Any hints ? -- http://mail.python.org/mailman/listinfo/python-list
Any HTML to Latex module available in Python
Any HTML to Latex module available in Python which I can use to convert HTML text to Latex Ramdas -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Hello Arnaud, Imagine I have three functions a(x), b(x), c(x) that each return something or raise an exception. Imagine I want to define a function that returns a(x) if possible, otherwise b(x), otherwise c(x), otherwise raise CantDoIt. Exceptions are for error handling, not flow control. Here are three ways I can think of doing it: ... # This one only works because a,b,c are functions # Moreover it seems like an abuse of a loop construct to me def rolled_first(x): for f in a, b, c: try: return f(x) except: continue raise CantDoIt My vote is for that one. I don't feel happy with any of these. Is there a more satisfying way of doing this in Python? What I would like is something like: -- # This one isn't correct but looks the clearest to me def wished_first(x): try: return a(x) except: return b(x) except: return c(x) except: raise CantDoIt Again, exception are for error handling, not for flow control. As a side note, try to avoid catch:, always catch explicit exceptions. HTH, Miki [EMAIL PROTECTED] http://pythonwise.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
RE: Python 2.1 and Daylight saving time
Thanks for the quick reply. Help me OB1, I mainly needed to know if I could avert Daylight Saving Time issues by upgrading to Python 2.5. It appears that Python gets it UTC settings from a table in the C library. Does this still hold true for Python 2.5. It looks that it will fail to recognize the new DST 2007 changes. Thanks again, Wayne Hammett - MCSE Snr. Network Engineer 1214 Church Street Nashville, TN 37246 (615) 747-3092 [EMAIL PROTECTED] -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 07, 2007 1:41 PM To: Hammett, Wayne Cc: [EMAIL PROTECTED] Subject: Re: Python 2.1 and Daylight saving time Wayne It appears that Python 2.1 is affected by the DST 2007 issue. I Wayne cannot really tell. Wayne Can you point me to support documentation? Wayne, Python 2.1 is quite old and no longer supported. The last 2.1 release (2.1.3) was April 8, 2002. The current release is Python 2.5. That said, can you describe your problem clearly? Do you have a simple script that demonstrates the problem? If so, it's possible that you can get some help from the folks on the python-list@python.org mailing list. At the very least people should be able to tell you if the problem you see exists in later versions or if there's a bug in your script you can fix to avoid the problem. -- Skip Montanaro - [EMAIL PROTECTED] - http://www.webfast.com/~skip/ The hippies and the hipsters did some great stuff in the sixties, but the geeks pulled their weight too. -- Billy Bragg -- http://mail.python.org/mailman/listinfo/python-list
Re: Why does SocketServer default allow_reuse_address = false?
Greg Copeland wrote: Is there some history to this of which I'm not aware? Is there a good reason for it to default to false? SNIP Greg's very informative reply Long story short, it is not a bug. It is a feature. The proper default is that of the OS, which is to ensure SO_REUSEADDR is disabled unless you absoluetely understand what you're buying by enabling it. Thanks for your reply. Those are all point of which I had not been aware. My problem (and the reason I set reuse to True) is this: if I have connections active when I restart my service, upon restart, the socket will fail to bind because there is still a connection in a WAIT state. And until that old connection goes away (30 seconds or so?) I cannot restart the service. So, the only option would be to sit there in a loop calling serve_forever until it doesn't throw a can't bind to socket exception. Or is there something I'm *really* missing about the way SocketServer is supposed to work? Am I supposed to notify my connection threads to shut down and disconnect properly? Which gets even more fun since they are sitting there waiting for input on the connection and not in a position to respond to other events...gets back to the fun of killing threads that are blocking. j -- Joshua Kugler Lead System Admin -- Senior Programmer http://www.eeinternet.com PGP Key: http://pgp.mit.edu/ ID 0xDB26D7CE -- Posted via a free Usenet account from http://www.teranews.com -- http://mail.python.org/mailman/listinfo/python-list
Re: SPE python IDE: Call for testers!
On 6 Mrz., 23:21, MonkeeSage [EMAIL PROTECTED] wrote: Very nice. One issue I've come across is that it doesn't seem to work with wxwidgets-2.8 (segfault when trying to load a file), so you should probably set MIN_WX_VERSION to 2.8. Regards, Jordan Hi Jordan, Thanks for trying. Did you try from subversion? Could you send me the debug output (python SPE.py --debug) or send me the file you were trying to open? SPE has not any specific wxPython2.8 feature, so I am very curious what causes the error. Stani PS Erratum: I forgot to update my blog with the changes in SPE: now you can read them at: http://pythonide.stani.be -- http://mail.python.org/mailman/listinfo/python-list
Re: thread and portability Unix/Linux
awalter1 wrote: Hi, I have a Python application that runs under HPUX 11.11 (then unix). It uses threads : from threading import Thread # Class Main class RunComponent(Thread): My application should run under Linux (red hat 3 ou 4) and I read that differences exist between the implementation of threads : on HPUX 11.11 there is CMA (ou DCE) threads and on Linux POSIX thread. Do you think that my Python application should be modified or may be such differences are hidden by the python interpreter ? In other terms, do I get some risks on this particular aspect by porting my application ? Thanks a lot PS: If you are aware of other risk of porting, I am interested too. The Python threading model abstracts from the underlying OS threading, so there should be no need to change anything (AFAIK). j -- Joshua Kugler Lead System Admin -- Senior Programmer http://www.eeinternet.com PGP Key: http://pgp.mit.edu/ ID 0xDB26D7CE -- Posted via a free Usenet account from http://www.teranews.com -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
On 7 Mar, 19:26, Miki [EMAIL PROTECTED] wrote: Hello Arnaud, Hi Miki [snip] Exceptions are for error handling, not flow control. Maybe but it's not always that clear cut! As error handling is a form of flow control the two have to meet somewhere. [snip] As a side note, try to avoid catch:, always catch explicit exceptions. I didn't specify what I wanted to catch because it didn't feel it was relevant to the problem. Thanks -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Why does SocketServer default allow_reuse_address = false?
On 3/7/07, Joshua J. Kugler [EMAIL PROTECTED] wrote: Greg Copeland wrote: Is there some history to this of which I'm not aware? Is there a good reason for it to default to false? SNIP Greg's very informative reply Long story short, it is not a bug. It is a feature. The proper default is that of the OS, which is to ensure SO_REUSEADDR is disabled unless you absoluetely understand what you're buying by enabling it. Thanks for your reply. Those are all point of which I had not been aware. My problem (and the reason I set reuse to True) is this: if I have connections active when I restart my service, upon restart, the socket will fail to bind because there is still a connection in a WAIT state. And until that old connection goes away (30 seconds or so?) I cannot restart the service. So, the only option would be to sit there in a loop calling serve_forever until it doesn't throw a can't bind to socket exception. Or is there something I'm *really* missing about the way SocketServer is supposed to work? Am I supposed to notify my connection threads to shut down and disconnect properly? Which gets even more fun since they are sitting there waiting for input on the connection and not in a position to respond to other events...gets back to the fun of killing threads that are blocking. j This is just the way sockets work on your platform. How exactly sockets shut down, and the exact effect that SO_REUSEADDR varies from platform to platform. In your case, using it is probably reasonable. -- http://mail.python.org/mailman/listinfo/python-list
Re: using python to query active directory
David Bear wrote: Is it possible to use python to make calls agains microsoft active directory? What do you mean with calls agains microsoft active directory? Querying user and computer entries etc.? python-ldap might be an option for you. Ciao, Michael. -- http://mail.python.org/mailman/listinfo/python-list
Is numeric keys of Python's dictionary automatically sorted?
I am coding a radix sort in python and I think that Python's dictionary may
be a choice for bucket.
The only problem is that dictionary is a mapping without order. But I just
found that if the keys are numeric, the keys themselves are ordered in the
dictionary.
part of my code is like this:
radix={}
for i in range(256):
radix[i]=[]
I checked and found that it is ordered like: {1:[], 2:[], 3[],...}
So I can just print out the contents of the dictionary in the desired order
without additional code.
I also tried adding new numeric keys and found that the dictionary's keys
are still ordered.
However, I am not sure whether it is always like this. Can anybody confirm
my finding?
--
http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
In [EMAIL PROTECTED], Arnaud Delobelle wrote: # This one only works because a,b,c are functions # Moreover it seems like an abuse of a loop construct to me def rolled_first(x): for f in a, b, c: try: return f(x) except: continue raise CantDoIt -- Why do you think this is an abuse? I think it's a perfectly valid use of a loop. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
In [EMAIL PROTECTED], Miki wrote: Exceptions are for error handling, not flow control. That's not true, they are *exceptions* not *errors*. They are meant to signal exceptional situations. And at least under the cover it's used in every ``for``-loop because the end condition is signaled by a `StopIteration` exception. Looks like flow control to me. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
More M2Crypto build problems
Trying to build M2Crypto on a dedicated server running Red Hat Fedora Core 6. I'm trying to do this right, without manual patching. The error message I'm getting during build is: python setup.py build ... swig -python -I/usr/include -o SWIG/_m2crypto_wrap.c SWIG/_m2crypto.i /usr/include/openssl/opensslconf.h:27: Error: CPP #error This openssl-devel package does not work your architecture?. Use the -cpperraswarn option to continue swig processing. error: command 'swig' failed with exit status 1 We went through this before, but last time, the versions of OpenSSL and of SWIG on the system were old, and I was running on a shared server and couldn't update it. Eventually, M2Crypto was hammered into working, but it was ugly. It was necessary to patch setup.py as follows: 107,108d106 target_cpu_str = '-D__i386__' # PATCH - assume Intel target. OpenSSL build needs this. 116c114 swig_opts = [swig_opts_str,target_cpu_str] --- swig_opts = [swig_opts_str] The problem is that the include file in OpenSSL assumes that some system ID, like __i386__, is defined, which GCC does, but SWIG does not. It might be considered a bug in SWIG. This time, everything on the dedicated server has been updated with Yum, so it ought to just work. Yum says: Installed Packages openssl.i686 0.9.8a-5.4 installed openssl-devel.i386 0.9.8a-5.4 installed python.i386 2.4.3-9.FC5installed swig.i3861.3.31-0.fc5 installed Available Packages openssl.i386 0.9.8a-5.4 updates All of those are later than the ones required for M2Crypto, so the system should be current. But it doesn't. Also reported as a SWIG bug, as #1676049. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Direct memory access
Collin Stocks wrote: Does anyone know how to directly handle memory using python? I want to be able, for example, to copy the actual contents of a memory address, or set the actual contents of a memory address. This kind of thing is generally not what Python is used for, so it's not really easy to do. Writing to arbitrary memory areas is an easy way to cause segmentation violations which Python and its extensions try to make segmentation violations (memory violations) as near impossible as they can. If you really need to do this then you can use ctypes to do it. Let N be the number of bytes you want to access, then import ctypes g = (ctypes.c_char*N).from_address(addr) g is now a settable sequence of bytes that you can read and write to using strings. g[0] # read the first byte g[1] # read the second byte g[0] = '\x24' # set the first byte to hexadecimal 24 etc... If you don't have permission to write to addr then you will get memory violations and your program will crash if you try to read from or write to the resulting sequence. -Travis -- http://mail.python.org/mailman/listinfo/python-list
Re: finding monitor or screen resolution in Linux with standard python module
On Mar 7, 11:25 am, akbar [EMAIL PROTECTED] wrote: I googled and searched in archive. All I can find is finding resolution with Tkinter and pygame. Any idea to find monitor resolution with standard python module? I can check from output of: xprop -root _NET_DESKTOP_GEOMETRY(CARDINAL) . The problem is when you use Beryl or Xgl, it is not correct anymore because Beryl or Xgl set this value from amount of workspaces multiplied by monitor or screen resolution. A method 'screen' from Python X Library looks promising: http://python-xlib.sourceforge.net/doc/html/python-xlib_16.html#SEC15 More, or less if I understand right you just need to request from server dimensions of the screen, over x protocol of course. So it will be something associated with Xlib. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is numeric keys of Python's dictionary automatically sorted?
On Mar 7, 8:18 pm, John [EMAIL PROTECTED] wrote: ... However, I am not sure whether it is always like this. Can anybody confirm my finding? From the standard library docs: Keys and values are listed in an arbitrary order which is non-random, varies across Python implementations, and depends on the dictionary's history of insertions and deletions. i.e. the behaviour you have discovered is an implementation detail, and could change in future versions. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is numeric keys of Python's dictionary automatically sorted?
On Wed, 2007-03-07 at 15:18 -0500, John wrote:
I am coding a radix sort in python and I think that Python's dictionary may
be a choice for bucket.
The only problem is that dictionary is a mapping without order. But I just
found that if the keys are numeric, the keys themselves are ordered in the
dictionary.
No.
The sequence of keys in a dictionary is a coincidental side effect of
the particular Python implementation, the number of keys, the values of
the keys, and the order in which the keys are inserted. You must not
rely on the keys appearing in any particular order.
Here is a simple counterexample that breaks the ordering, at least for
the version I'm running:
d = {}
for i in range(0,6): d[10**i] = []
...
d
{10: [], 1: [], 100: [], 1000: [], 10: [], 1: []}
-Carsten
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is numeric keys of Python's dictionary automatically sorted?
Then is there anyway to sort the numeric keys and avoid future implemetation confusion? Ant [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] On Mar 7, 8:18 pm, John [EMAIL PROTECTED] wrote: ... However, I am not sure whether it is always like this. Can anybody confirm my finding? From the standard library docs: Keys and values are listed in an arbitrary order which is non-random, varies across Python implementations, and depends on the dictionary's history of insertions and deletions. i.e. the behaviour you have discovered is an implementation detail, and could change in future versions. -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Arnaud Delobelle wrote:
Hi all,
Imagine I have three functions a(x), b(x), c(x) that each return
something or raise an exception. Imagine I want to define a function
that returns a(x) if possible, otherwise b(x), otherwise c(x),
otherwise raise CantDoIt.
Here are three ways I can think of doing it:
--
# This one looks ugly
def nested_first(x):
try:
return a(x)
except:
try:
return b(x)
except:
try:
return c(x)
except:
raise CantDoIt
# This one looks long-winded
def flat_first(x):
try:
return a(x)
except:
pass
try:
return b(x)
except:
pass
try:
return c(x)
except:
raise CantDoIt
# This one only works because a,b,c are functions
# Moreover it seems like an abuse of a loop construct to me
def rolled_first(x):
for f in a, b, c:
try:
return f(x)
except:
continue
raise CantDoIt
--
I don't feel happy with any of these. Is there a more satisfying way
of doing this in Python? What I would like is something like:
--
# This one isn't correct but looks the clearest to me
def wished_first(x):
try:
return a(x)
except:
return b(x)
except:
return c(x)
except:
raise CantDoIt
--
I guess what I'm looking for is some sort of
if:
elif:
...
elif:
else:
but for try: except:
That's why
try:
except:
except:
...
except:
seemed natural to me :) And I'd like to find a nice way to do this in
a syntactically correct way.
Note: I've chosen functions a, b, c, but really I'm looking for a way
that is suitable for any chunk of code.
Without knowing more about the functions and the variable it is somewhat
hard to tell what you are trying to accomplish. If a, b, c are functions
that act on x when it is a different type, change to one function that
can handle all types.
def d(x):
if isinstance(x, basestring):
#
# Code here for string
#
elif isinstance(x, int):
#
# Code here for int
#
elif isinstance(x, float):
#
# Code here for string
#
else:
raise ValueError
If they are different functions based on type do something like this:
#
# Set up a dictionary with keys for different types and functions
# that correspond.
#
fdict={type(''): a, type(1): b, type(1.0): c}
#
# Call the appropriate function based on type
#
fdict[type(x)](x)
-Larry
--
http://mail.python.org/mailman/listinfo/python-list
Re: Debugging segmentation faults
If the error is reproducable and you can run wxPython, you could use the excellent WinPdb debugger, which ships with SPE (python editor): http://www.digitalpeers.com/pythondebugger/ ... but if you can only run your script on a remote server this won't help you. Stani -- SPE - http://pythonide.stani.be On 7 Mrz., 20:15, George Sakkis [EMAIL PROTECTED] wrote: I have a pure python program (no C extensions) that occasionally core dumps in a non-reproducible way. The program is started by a (non- python) cgi script when a form is submitted. It involves running a bunch of other programs through subprocess in multiple threads and writing its output in several files. So the only suspicious parts I can think of is subprocess and/or multithreading. For the multithreading part I'm using a modified version of threadpool.py (http://www.chrisarndt.de/en/software/python/threadpool/), which is built on top of the threading and Queue stdlib modules. Whatever bugs may linger there, I'd hope that they would show up as normal Python exceptions instead of segfaults. All I have now is a few not particularly insightful core files (actual path names and args changed for privacy): /home/gsakkis/foogdb --core core.20140 GNU gdb Red Hat Linux (5.2-2) Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type show copying to see the conditions. There is absolutely no warranty for GDB. Type show warranty for details. This GDB was configured as i386-redhat-linux. Core was generated by `python2.5 /home/gsakkis/foo/foo.py --XXX -- max=30 --bar=/tmp/83840` Program terminated with signal 11, Segmentation fault. #0 0x080b222d in ?? () (gdb) backtrace #0 0x080b222d in ?? () #1 0x080b28d1 in ?? () #2 0x080fa8ab in ?? () #3 0x0805c918 in ?? () (...) #28 0x080b310f in ?? () #29 0x080dbfdd in ?? () #30 0x40021fef in ?? () Any hints ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Why does SocketServer default allow_reuse_address = false?
Chris Mellon wrote: My problem (and the reason I set reuse to True) is this: if I have connections active when I restart my service, upon restart, the socket will fail to bind because there is still a connection in a WAIT state. This is just the way sockets work on your platform. How exactly sockets shut down, and the exact effect that SO_REUSEADDR varies from platform to platform. In your case, using it is probably reasonable. Thank you. Glad to know I've chosen the best solution for my situation. j -- Joshua Kugler Lead System Admin -- Senior Programmer http://www.eeinternet.com PGP Key: http://pgp.mit.edu/ ID 0xDB26D7CE -- Posted via a free Usenet account from http://www.teranews.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Is numeric keys of Python's dictionary automatically sorted?
John wrote: Then is there anyway to sort the numeric keys and avoid future implemetation confusion? sorted(mydict.keys()) -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Generator expression parenthesis mixed with function call ones
En Wed, 07 Mar 2007 15:21:57 -0300, Laurent Pointal [EMAIL PROTECTED] escribió: Gabriel Genellina wrote: En Wed, 07 Mar 2007 12:53:43 -0300, Laurent Pointal [EMAIL PROTECTED] escribió: Why does Python allow generator expression parenthesis to be mixed with function call parenthesis when there is only one parameter ? Beginners generally know about list-comprehensions and associate the syntax x for x in asequence to a list expression. I'm not sure that But list comprehensions have [] around... When you don't see the [], you should think this is something different... reading a f(i for i in range(20)) they understand that they are dealing with a different object kind. Exactly. If function f start by a if len(myparameter)... TypeError: len() of unsized object If function f goes among its parameter with for x in myparameter more than once, other loops goes throught an empty loop. Then he thinks Something is wrong!, and reads some Python books, or asks here, and somebody will point him to the Python Tutorial, section 9.11: http://docs.python.org/tut/node11.html#SECTION000 IMHO this should be forbidden, usage must not be different when there is only one parameter and when there are more parameters. If you want to review the original discussion on how to spell a generator expression (called accumulator display by that time) see http://mail.python.org/pipermail/python-dev/2003-October/038868.html -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Debugging segmentation faults
You're using Python on a web server to do something complicated. You must suffer. Are you trying to fork off a subprocess in a multithreaded program? That's unlikely to work. The sematics differ from OS to OS (Solaris forks all the threads, most other operating systems don't; most UNIX-based OSs copy all the open file descriptors, but some give you control of which open files are passed), and Python may not be thread-safe in that area. John Nagle SPE - Stani's Python Editor wrote: If the error is reproducable and you can run wxPython, you could use the excellent WinPdb debugger, which ships with SPE (python editor): http://www.digitalpeers.com/pythondebugger/ ... but if you can only run your script on a remote server this won't help you. Stani -- SPE - http://pythonide.stani.be On 7 Mrz., 20:15, George Sakkis [EMAIL PROTECTED] wrote: I have a pure python program (no C extensions) that occasionally core dumps in a non-reproducible way. The program is started by a (non- python) cgi script when a form is submitted. It involves running a bunch of other programs through subprocess in multiple threads and writing its output in several files. So the only suspicious parts I can think of is subprocess and/or multithreading. For the multithreading part I'm using a modified version of threadpool.py (http://www.chrisarndt.de/en/software/python/threadpool/), which is built on top of the threading and Queue stdlib modules. Whatever bugs may linger there, I'd hope that they would show up as normal Python exceptions instead of segfaults. All I have now is a few not particularly insightful core files (actual path names and args changed for privacy): /home/gsakkis/foogdb --core core.20140 GNU gdb Red Hat Linux (5.2-2) Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type show copying to see the conditions. There is absolutely no warranty for GDB. Type show warranty for details. This GDB was configured as i386-redhat-linux. Core was generated by `python2.5 /home/gsakkis/foo/foo.py --XXX -- max=30 --bar=/tmp/83840` Program terminated with signal 11, Segmentation fault. #0 0x080b222d in ?? () (gdb) backtrace #0 0x080b222d in ?? () #1 0x080b28d1 in ?? () #2 0x080fa8ab in ?? () #3 0x0805c918 in ?? () (...) #28 0x080b310f in ?? () #29 0x080dbfdd in ?? () #30 0x40021fef in ?? () Any hints ? -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Miki a écrit : Hello Arnaud, Imagine I have three functions a(x), b(x), c(x) that each return something or raise an exception. Imagine I want to define a function that returns a(x) if possible, otherwise b(x), otherwise c(x), otherwise raise CantDoIt. Exceptions are for error handling, not flow control. def until(iterable,sentinel): for item in iterable: if item == sentinel: raise StopIteration yield item for item in until(range(10), 5): ... print item ... 0 1 2 3 4 Exceptions *are* a form of flow control. -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Larry Bates a écrit : (snip) def d(x): if isinstance(x, basestring): # # Code here for string # elif isinstance(x, int): # # Code here for int # elif isinstance(x, float): # # Code here for string # else: raise ValueError As a side note : While there are a few corner cases where this is hardly avoidable (and yet I'd rather test on interface, not on concrete type), this kind of cose is exactly what OO polymorphic dispatch is supposed to avoid (no, don't tell me: I know you can't easily add methods to most builtin types). -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
En Wed, 07 Mar 2007 19:00:59 -0300, Bruno Desthuilliers [EMAIL PROTECTED] escribió: this kind of cose is exactly what OO polymorphic dispatch is supposed to this kind of cose? Ce genre de chose? -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
On Mar 7, 8:52 pm, Larry Bates [EMAIL PROTECTED] wrote: [snip] Without knowing more about the functions and the variable it is somewhat hard to tell what you are trying to accomplish. If a, b, c are functions that act on x when it is a different type, change to one function that can handle all types. I'm not really thinking about this situation so let me clarify. Here is a simple concrete example, taking the following for the functions a,b,c I mention in my original post. - a=int - b=float - c=complex - x is a string This means I want to convert x to an int if possible, otherwise a float, otherwise a complex, otherwise raise CantDoIt. I can do: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). Besides I am not happy with the other two idioms I can think of. -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Arnaud Delobelle a écrit : Hi all, Imagine I have three functions a(x), b(x), c(x) that each return something or raise an exception. Imagine I want to define a function that returns a(x) if possible, otherwise b(x), otherwise c(x), otherwise raise CantDoIt. Here are three ways I can think of doing it: -- # This one looks ugly Yes. def nested_first(x): try: return a(x) except: side-note Try avoiding bare except clauses. It's usually way better to specify the type(s) of exception you're expecting to catch, and let other propagate. /side-note try: return b(x) except: try: return c(x) except: raise CantDoIt # This one looks long-winded Yes. And not's very generic. def flat_first(x): try: return a(x) except: pass try: return b(x) except: pass try: return c(x) except: raise CantDoIt # This one only works because a,b,c are functions It works with any callable. Anyway, what else would you use here ??? # Moreover it seems like an abuse of a loop construct to me Why so ? loops are made for looping, adn functions are objects like any other. def rolled_first(x): for f in a, b, c: try: return f(x) except: continue raise CantDoIt Here's an attempt at making it a bit more generic (side-noteit still lacks a way to specify which kind of exceptions should be silently swallowed/side-note. def trythese(*functions): def try_(*args, **kw): for func in functions: try: return func(*args, **kw) except: # FIX ME : bare except clause pass else: # really can't do it, sorry raise CantDoIt return try_ result = trythese(a, b, c)(x) -- # This one isn't correct but looks the clearest to me def wished_first(x): try: return a(x) except: return b(x) except: return c(x) except: raise CantDoIt Having multiple except clauses is correct - but it has another semantic. Note: I've chosen functions a, b, c, but really I'm looking for a way that is suitable for any chunk of code. A function is an object wrapping a chunk of code... I personnaly find the loop-based approach quite clean and pythonic. -- http://mail.python.org/mailman/listinfo/python-list
Re: Direct memory access
Thanks. I didn't know about ctypes. -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
On Mar 7, 2:48 pm, Arnaud Delobelle [EMAIL PROTECTED] wrote: I'm not really thinking about this situation so let me clarify. Here is a simple concrete example, taking the following for the functions a,b,c I mention in my original post. - a=int - b=float - c=complex - x is a string This means I want to convert x to an int if possible, otherwise a float, otherwise a complex, otherwise raise CantDoIt. I can do: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). Besides I am not happy with the other two idioms I can think of. -- Arnaud Wouldn't it be easier to do: if isinstance(x, int): # do something elif isinstance(x, float)t: # do something elif isinstance(x, complex): # do something else: raise CantDoIt or, i = [int, float, complex] for f in i: if isinstance(x, f): return x else: raise CantDoIt -- http://mail.python.org/mailman/listinfo/python-list
RE: Python 2.1 and Daylight saving time
removing webmaster email address... Others reading this with more experience manipulating timezones please reply. This is completely out of the realm of my experience, but since I pointed Wayne here from the webmaster mailing list I felt I should respond. What I've written is based solely on reading a bit of the current time module documentation and peeking at the time module source (ever-so-briefly). Wayne I mainly needed to know if I could avert Daylight Saving Time Wayne issues by upgrading to Python 2.5. Wayne It appears that Python gets it UTC settings from a table in the C Wayne library. Does this still hold true for Python 2.5. It looks that Wayne it will fail to recognize the new DST 2007 changes. Python's timezone code is reliant on the functions provided by your system's libc routines. Starting in Python 2.3 if your system has a working tzset() function in libc the time module exposes a tzset() function which you can use to change the rules used by your system. If your system's timezone information hasn't been updated I imagine you could coax the correct behavior out of your application with tzset(). I suggest you read the relevant documentation http://docs.python.org/dev/lib/module-time.html before contemplating upgrading from 2.1 to something more recent and/or modifying your application to use tzset(). Given the minimal amount of time between now and Sunday morning I suspect your best chance of correct operation will be to have the correct timezone tables installed on your computer. Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Gabriel Genellina a écrit : En Wed, 07 Mar 2007 19:00:59 -0300, Bruno Desthuilliers [EMAIL PROTECTED] escribió: this kind of cose is exactly what OO polymorphic dispatch is supposed to this kind of cose? sorry s/cose/code/ Ce genre de chose? En quelques sortes, oui, quoique pas tout à fait !-) -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
On Mar 7, 3:04 pm, [EMAIL PROTECTED] wrote: On Mar 7, 2:48 pm, Arnaud Delobelle [EMAIL PROTECTED] wrote: I'm not really thinking about this situation so let me clarify. Here is a simple concrete example, taking the following for the functions a,b,c I mention in my original post. - a=int - b=float - c=complex - x is a string This means I want to convert x to an int if possible, otherwise a float, otherwise a complex, otherwise raise CantDoIt. I can do: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). Besides I am not happy with the other two idioms I can think of. -- Arnaud Wouldn't it be easier to do: if isinstance(x, int): # do something elif isinstance(x, float)t: # do something elif isinstance(x, complex): # do something else: raise CantDoIt or, i = [int, float, complex] for f in i: if isinstance(x, f): return x else: raise CantDoIt I so missed the point of this. Not my day. Please ignore my post. -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
En Wed, 07 Mar 2007 18:48:18 -0300, Arnaud Delobelle [EMAIL PROTECTED] escribió: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). Besides I am not happy with the other two idioms I can think of. Hmmm, functions are cheap - nobody is charging you $2 for each def statement you write, I presume :) A bit more serious, if those chunks of code are processing its input and returning something that you further process... they *are* functions. If you don't want them to be publicly available, use inner functions: def xxxfactory(x): def f1(x): ... def f2(x): ... def f3(x): ... for f in f1,f2,f3: try: return f(x) ... same as above... -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Direct memory access
One last thing. Does anyone know how to take a python object and measure how much space it is taking up in memory? I'm thinking probably not, but it's worth asking. -- http://mail.python.org/mailman/listinfo/python-list
Re: merits of Lisp vs Python
George Sakkis wrote: [EMAIL PROTECTED] wrote: 1. Lisp is the only industrial strength language ^^^ You keep using that phrase. I don't think it means what you think it means. [Vizzini has just cut the rope The Dread Pirate Roberts is climbing up] Vizzini: HE DIDN'T FALL? INCONCEIVABLE. Inigo Montoya: You keep using that word. I do not think it means what you think it means. -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Arnaud Delobelle a écrit : On Mar 7, 8:52 pm, Larry Bates [EMAIL PROTECTED] wrote: [snip] Without knowing more about the functions and the variable it is somewhat hard to tell what you are trying to accomplish. If a, b, c are functions that act on x when it is a different type, change to one function that can handle all types. I'm not really thinking about this situation so let me clarify. Here is a simple concrete example, taking the following for the functions a,b,c I mention in my original post. - a=int - b=float - c=complex - x is a string This means I want to convert x to an int if possible, otherwise a float, otherwise a complex, otherwise raise CantDoIt. I can do: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions You have to write the chunks of code anyway, don't you ? So just adding a def statement above each chunk is not such a big deal. Remember that you can define nested funcs, that will close over the namespace of the enclosing one, so you dont necessarily have to pollute the global namespace nor explicitly pass the whole environment to each of these functions. Using the generic higher order func I proposed in a previous answer: def maincode(tati, pouffin): def a(): # some # code # here # that may raise return foo def b(): # some # shorter chunk return bar def c(): # yet # some # other # code return quux return trythese(a, b)() Is it really less readable than: def maincode(tati, pouffin): try: # some # code # here # that may raise return foo except_retry: # the missing(???) keyword you're after # some # shorter chunk return bar except_retry: # yet # some # other # code return quux else: raise CantDoIt simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). Besides I am not happy with the other two idioms I can think of. -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Best place for a function?
I'm writing a class, where one of the methods is kinda complex. The method uses a function which I know for certain will not be used anywhere else. This function does not require anything from self, only the args passed by the method. Where should I put the function? a) Inside the module but outside the class (to avoid cluttering it; besides the function does not require to access any property or method of the class). # mymodule.py def _myfunction(): ... class myclass(object): def mymethod(self): ... spam = _myfunction() ... b) Inside the class but outside the method # mymodule.py class myclass(object): def _myfunction(self): ... def mymethod(self): ... spam = self._myfunction() ... c) Inside the method: # mymodule.py class myclass(object): ... def mymethod(self): def _myfunction(self): ... ... spam = self._myfunction() ... I'm new to python (and couldn't find anything about this in PEP 8). What would you suggest me? Thanks Sergio -- http://mail.python.org/mailman/listinfo/python-list
Re: Best place for a function?
Sergio Correia schrieb: I'm writing a class, where one of the methods is kinda complex. The method uses a function which I know for certain will not be used anywhere else. This function does not require anything from self, only the args passed by the method. Where should I put the function? a) Inside the module but outside the class (to avoid cluttering it; besides the function does not require to access any property or method of the class). # mymodule.py def _myfunction(): ... class myclass(object): def mymethod(self): ... spam = _myfunction() ... b) Inside the class but outside the method # mymodule.py class myclass(object): def _myfunction(self): ... def mymethod(self): ... spam = self._myfunction() ... c) Inside the method: # mymodule.py class myclass(object): ... def mymethod(self): def _myfunction(self): ... ... spam = self._myfunction() ... I'm new to python (and couldn't find anything about this in PEP 8). What would you suggest me? If it really has no other use as in this class, put it as an instancemethod in there. Alternatively, you _could_ nest it like this: class Foo(object): def bar(self): def my_long_important_method(argument): pass pass Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Gabriel Genellina a écrit : En Wed, 07 Mar 2007 18:48:18 -0300, Arnaud Delobelle [EMAIL PROTECTED] escribió: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). Besides I am not happy with the other two idioms I can think of. Hmmm, functions are cheap To define. You pay the price when you call them !-) (sorry, couldn't resist - I otherwise totally agree with you) -- http://mail.python.org/mailman/listinfo/python-list
Re: More M2Crypto build problems
Still more M2Crypto build problems:
In M2Crypto's file SWIG/_ec.i, there's this:
#if OPENSSL_VERSION_NUMBER 0x0090800fL || defined(OPENSSL_NO_EC)
#undef OPENSSL_NO_EC
%constant OPENSSL_NO_EC = 1;
#else
%constant OPENSSL_NO_EC = 0;
%{
#include openssl/bn.h
#include openssl/err.h
#include openssl/pem.h
#include openssl/x509.h
#include openssl/ecdsa.h
#include openssl/ecdh.h
%}
There's the assumption here that versions of OpenSSL greater than 0.9.08???
contain elliptical curve cryptography support. There's
also the assumption that ecdsa.h is present; it is included
unconditionally, and definitions from it are used later.
Unfortunately, the ones that ship with Fedora Core 5 and 6 do not have it:
http://threebit.net/mail-archive/fedora-list/msg14507.html
Updating with yum doesn't help. Apparently there are patent problems
with the algorithm, and Red Hat pulled that code. See
http://en.wikipedia.org/wiki/ECC_patents
I'm trying to get M2Crypto to build without elliptical cryptography, but
it's not working
John Nagle
Python. Embrace the pain.
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Re: Best place for a function?
Sergio Correia a écrit : I'm writing a class, where one of the methods is kinda complex. The method uses a function which I know for certain will not be used anywhere else. This function does not require anything from self, only the args passed by the method. Where should I put the function? Somewhere in your module ?-) (snip) If your problem is to reduce the apparent complexity of the method, defining the function inside the method won't help that much (unless the function by itself is short enough - and event then...). Apart from having a direct access to the method's namespace, you don't gain much by doing so. And if it's a an implementation function that doesn't need to access the instance, it has no reason to be a method. Moreover, since it's not part of neither the class or the module interface, you can freely change your mind if and when you find a need to do so. -- http://mail.python.org/mailman/listinfo/python-list
Re: catching exceptions from an except: block
Arnaud Delobelle schrieb: On Mar 7, 8:52 pm, Larry Bates [EMAIL PROTECTED] wrote: [snip] Without knowing more about the functions and the variable it is somewhat hard to tell what you are trying to accomplish. If a, b, c are functions that act on x when it is a different type, change to one function that can handle all types. I'm not really thinking about this situation so let me clarify. Here is a simple concrete example, taking the following for the functions a,b,c I mention in my original post. - a=int - b=float - c=complex - x is a string This means I want to convert x to an int if possible, otherwise a float, otherwise a complex, otherwise raise CantDoIt. I can do: for f in int, float, complex: try: return f(x) except ValueError: continue raise CantDoIt But if the three things I want to do are not callable objects but chunks of code this method is awkward because you have to create functions simply in order to be able to loop over them (this is whay I was talking about 'abusing loop constructs'). In your case, I don't consider it an abuse - au contraire. Because in such a situation where a possibly growing number of functions dealing with one value until one of them fits a loop is the natural thing to do, as it won't change in appearance just because you add a new conversion-function to some (semi-)global list. I'd consider it especially good style in that case. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: image processing
edurand wrote: Hi, We are are pleased to announce the version 3.0 of the image processing library 'Filters'. You can use it in Python, and we have provided tutorials and samples in Python, with for exemple conversion from/to PIL image format. Have a look at : http://filters.sourceforge.net/ it's open source of course regards edurand In the context of this posting it would be interesting for me (and maybe also to others) to know: What was the actual motivation behind the project? What are other image processing packages missing, that is worth to be covered by a separate package? (i.e. I checked http://filters.sourceforge.net/ out, but haven't yet found the mentioned questions answered ) Claudio Grondi -- http://mail.python.org/mailman/listinfo/python-list
Calling a function with unknown arguments?
I can get a list of a function's arguments.
def bob(a, b):
... return a+b
...
bob.func_code.co_varnames
('a', 'b')
Let's say that I also have a dictionary of possible arguments for this
function.
possible = {'a':10, 'b':5, 'c':-3}
How do I proceed to call bob(a=10, b=5) with this information?
Thanks!
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Re: Best place for a function?
Diez B. Roggisch: If it really has no other use as in this class, put it as an instancemethod in there. Alternatively, you _could_ nest it like this: Using an instancemethod may be the most formally correct solution for that problem, but often nested function are the simpler solution. A downside of nested functions is that you can't give them a doctest (in a simple way). Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: merits of Lisp vs Python
Brian Adkins wrote: George Sakkis wrote: [EMAIL PROTECTED] wrote: 1. Lisp is the only industrial strength language Neither Lisp nor Python is an industrial strength language. The infrastructure is too weak. Hosting providers and distro makers aren't concerned over whether Python works. They care if C, C++, Java, PHP, and Perl work, but not Python or LISP. Ask them. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling a function with unknown arguments?
On 2007-03-07, Rob [EMAIL PROTECTED] wrote:
I can get a list of a function's arguments.
def bob(a, b):
... return a+b
...
bob.func_code.co_varnames
('a', 'b')
Let's say that I also have a dictionary of possible arguments for this
function.
possible = {'a':10, 'b':5, 'c':-3}
How do I proceed to call bob(a=10, b=5) with this information?
bob(a=possible['a'],b=possible['b'])
--
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at CREAM O' WHEAT in another
visi.comDIMENSION...
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Re: Best place for a function?
I also found out I can't use `unittest` with nested functions :-( Thank you all for the responses, Best, Sergio On 7 Mar 2007 14:57:54 -0800, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Diez B. Roggisch: If it really has no other use as in this class, put it as an instancemethod in there. Alternatively, you _could_ nest it like this: Using an instancemethod may be the most formally correct solution for that problem, but often nested function are the simpler solution. A downside of nested functions is that you can't give them a doctest (in a simple way). Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling a function with unknown arguments?
En Wed, 07 Mar 2007 19:55:08 -0300, Rob [EMAIL PROTECTED] escribió:
I can get a list of a function's arguments.
def bob(a, b):
... return a+b
...
bob.func_code.co_varnames
('a', 'b')
Let's say that I also have a dictionary of possible arguments for this
function.
possible = {'a':10, 'b':5, 'c':-3}
How do I proceed to call bob(a=10, b=5) with this information?
You're almost done. Notice that co_varnames includes local variables too;
only the first co_argcount are positional arguments.
If you only want to deal with positional arguments (no *args, no **kw):
py def bob(a,b):
... c = a+b
... return c
...
py bob.func_code.co_varnames
('a', 'b', 'c')
py bob.func_code.co_argcount
2
py args = dict((name, possible[name]) for name in
bob.func_code.co_varnames[:bo
b.func_code.co_argcount] if name in possible)
py args
{'a': 10, 'b': 5}
py bob(**args)
15
It can handle missing arguments (if they have a default value, of course):
py def bob(a, k=3):
... return a+k
...
py args = dict((name, possible[name]) for name in
bob.func_code.co_varnames[:bo
b.func_code.co_argcount] if name in possible)
py args
{'a': 10}
py bob(**args)
13
--
Gabriel Genellina
--
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Re: merits of Lisp vs Python
John Nagle wrote: Neither Lisp nor Python is an industrial strength language. The infrastructure is too weak. Hosting providers and distro makers aren't concerned over whether Python works. They care if C, C++, Java, PHP, and Perl work, but not Python or LISP. Ask them. John Nagle In your excitement to post a sweeping and inaccurate generalization (you missed diss'ing Ruby), I think you may have missed the point of my post. I surely wasn't trying to restart a dead thread, I just thought it was funny that there was a similarity to a line from Princess Bride in the thread (see relevant part below that you cut out). If you want to restart a debate, please go back and reply to some serious post in the thread - don't hijack mine for your own evil purposes and cut out the good parts - did you even see the movie? George Sakkis wrote: You keep using that phrase. I don't think it means what you think it means. [Vizzini has just cut the rope The Dread Pirate Roberts is climbing up] Vizzini: HE DIDN'T FALL? INCONCEIVABLE. Inigo Montoya: You keep using that word. I do not think it means what you think it means. -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling a function with unknown arguments?
On Mar 7, 10:55 pm, Rob [EMAIL PROTECTED] wrote:
I can get a list of a function's arguments. def bob(a, b):
... return a+b
... bob.func_code.co_varnames
('a', 'b')
Let's say that I also have a dictionary of possible arguments for this
function.
possible = {'a':10, 'b':5, 'c':-3}
How do I proceed to call bob(a=10, b=5) with this information?
Thanks!
You can do this with a list comprehension:
bob(*[possible[k] for k in bob2.func_code.co_varnames])
The LC creates a list of arg values in the same order as the var names
for the function. Putting a * before the list when you call bob()
turns that list into it's arguments.
Alternativly (and this may not be useful) you can call a function with
a dictionary of arguments:
def bob(**kwargs):
print kwargs
possible = {'a' : 10, 'b':5, 'c':-3}
bob(**possible)
{'a': 10, 'c': -3, 'b': 5}
Tom
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Re: is it possible to give an instance a value?
Thanks everyone for your replies. The language is Cache Object Script, a language used in Intersystems Relational Dbase. I think egbert's answer provides the simplest answer. It allows our python interface to Cache to be almost identical to Cache Object Script, with simeply the addition of (), which we prefer to .val or .data for various reasons. Using the example .type was a mistake, as I meant simply any metadata about a value. If we make the instance callable, then we can have: instance() instance.calculated instance.type instance.whatever instance.save() etc thanks. -- http://mail.python.org/mailman/listinfo/python-list
Flatten a two-level list -- one liner?
Hi, I'm looking for an easy way to flatten a two level list like this spam = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]] Into something like eggs = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] There are *no* special cases (no empty sub-lists). I have found two ways: 1) Accumulator eggs = [] for x in eggs: eggs.extend(x) 2) Reduce eggs = reduce(lambda x, y: x+y, spam) I feel the 1st way is too cumbersome (three lines), and although I like the 2nd way (except for the lambda part), I understand reduce is discouraged by Guido so I want to know if there is a Better Way(TM) ? Any ideas? Thanks, Sergio PS: Why does `sum` works only with numbers? -- http://mail.python.org/mailman/listinfo/python-list
tkinter how to write
as I write my first gui program (text editor) I wanna ask you guys how to separate code in classes.? Should I put in one class my menu and in another class text and scorllbars etc? or something else? thanks -- http://mail.python.org/mailman/listinfo/python-list
