🌐 Mailman 3 December 2003 - Python-list - python.org

mod_python has empty POST
by Lucas Branca Dec. 29, 2003

Dec. 29, 2003

python 2.1.3 Debian woody Apache 1.3.26 mod python 2.7.8 ## ---- formtest.html ---- ## <form action="/formtest.py/main" method="POST"> <input type="submit" value="go" name="action"> <input type="hidden" name="hide" value="A"> </form> ## ---- formtest.py ------ ## import mod_python def main(req): form = mod_python.util.FieldStorage(req).list vars = '' for field in form: if isinstance(field, mod_python.util.Field): vars = "%s [%s] = %s" % (vars, field.name, field.value) return(vars) ## ---- results ---- ## if method is "POST" variable form is an empty list !!! <---- WRONG if method is "GET" it's all right and I receive a string containing : "[action] = go [hide] = A" why I cannot access POST variables????? ... I'm bouncing like a ball .... help! Lucas

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Re: PIL: jpeg comment
by John P. Speno Dec. 29, 2003

Dec. 29, 2003

In <mailman.86.1072217906.684.python-list(a)python.org> Gerrit Holl <gerrit(a)nl.linux.org> writes: >Hi, >how do I read a JPEG comment with the Python Imaging Library? PIL won't do it out of the box, but it's easy to add it. I posted a patch here: http://www.pycs.net/users/0000231/ Enjoy.

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just another default argument value gotcha
by fBechmann＠web.de Dec. 29, 2003

Dec. 29, 2003

Eventually most of you will not learn much from this because it's just another event in the 'default argument value gotcha' series, but because it cost me some hours yesterday to spot this 'error' in a famous python tool I thought it might still help other people to save some time. I tried to use some method which was documented to write to 'sys.stdout' per default so that changing 'sys.stdout' to bind to another object should allow to get grip on the method's output. but that didn't work - reason was that that 'sys.stdout' was used as default argument value for the method. The following code describes it better then my english can do, so as it seems for me, one should make sure to use the 'f2' variant. import StringIO, sys def f1(msg, out=sys.stdout): out.write("%s\n" % msg) def f2(msg, out=None): if not out: out = sys.stdout out.write("%s\n" % msg) if __name__ == "__main__": buf = sys.stdout = StringIO.StringIO() f1("calling f1") f2("calling f2") data = buf.getvalue() buf.close() sys.stdout = sys.__stdout__ print "=========\n", data results in: calling f1 <-- written directly by 'f1' ========== => redirection didn't work calling f2 <-- written from data stored in 'buf' running the following greps on this machine brought only 2 possible spots, but that doesn't mean too much since this is our gaming computer with only a very basic python installation; eventually someone with a real huge package list would bring up more hits: $ find . -name '*.py' -exec grep -H '\bdef\b.*$.*\=sys.stdout.*$[ \t]*:' \{} \; >> ./test/test_grammar.py:def tellme(file=sys.stdout): $ find . -name '*.py' -exec grep -H '\bdef\b.*$.*\=sys.stderr.*$[ \t]*:' \{} \; >> ./unittest.py: def __init__(self, stream=sys.stderr, descriptions=1, verbosity=1):

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why does py_compile.compile() miss some errors in sourcefile?
by fBechmann＠web.de Dec. 29, 2003

Dec. 29, 2003

where can I find some documentation, which errors will be found by 'py_compile.compile' and which will not be found. # t1.py # ===== import os.path import py_compile py_compile.compile(os.path.join(os.path.dirname(__file__), "t2.py"), doraise=True) # t2.py # ===== # following line is found as an error: # Class C: # <== 'SyntaxError: invalid syntax' class C: pass c = CC() # <== not found as an error from py_compile # but found as an error from python-executable: # 'NameError: name 'CC' is not defined' thx in advance

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Re: Best match searching
by Terry Reedy Dec. 29, 2003

Dec. 29, 2003

"Daniel Pryde" <ababo_2002(a)hotmail.com> wrote in message news:mailman.3.1072700087.8134.python-list@python.org... > Hi everyone. > I was wondering if anyone might be able to help me out here. I'm currently > looking to find the quickest way to find a best fit match in a large array. > My problem is that I have an array of, say, 600*400, which contains a value > at each point, and I need to find the value in that array which is closest > to the input value. It's basically some euclidean distances that I've > calculated, and I need to be able to find the best matches over a large > number of input values, so I was looking for a speedy solution to this. > The array is implemented simply using a list of lists. The only solution I > could think of is to use some for statements, but that seems to take a > while, even for just one search. > Any hints or tips would be really helpful. :-) If the values in the array have any structure or constraints, try to exploit that. If they are ordered in both directions, use binary search on one axis and then trace the zigzag frontier between lower and height values. If there are just a 'few' values (as in 0-255), then a dict might work, though changing values would complicate this. Terry J. Reedy

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Hi,do i can ask some question about Zope?
by mysoso282＠yahoo.com.cn Dec. 29, 2003

Dec. 29, 2003

I have some question in zope,but i can't get answer from Zope.org,may i ask the question here?

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Monitoring an MS Exchange mailbox
by Lindstrom Greg - glinds Dec. 29, 2003

Dec. 29, 2003

I have written a script to monitor my MS Exchange mailbox for certain messages and post information to an MS SQL Server Database. Everything works great except that each time I run the script I am prompted by Windows to choose the profile of the mailbox via a dialog box. I'd like to run the script every hour, so this is not good. Is there any way to either specify the profile or accept the default? Thanks for any help you can send my way. --greg ********************************************************************** The information contained in this communication is confidential, is intended only for the use of the recipient named above, and may be legally privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please re-send this communication to the sender and delete the original message or any copy of it from your computer system. Thank You.

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writing a linux screensaver?
by Dan Stromberg Dec. 29, 2003

Dec. 29, 2003

I'd like to examine what's involved in writing a screensaver for linux (xscreensaver) using python, and who-knows-what GUI toolkit. I looked over pygtk2, pygame, and wxpython, but none seem able to write to the root window (wallpaper) as required by xscreensaver (?). pygtk1 appears able, but of course it's going away. I hope to use GL a little bit, not necessarily with hardware acceleration, so a GUI toolkit that allows that is a big plus. pygame apparently can be told which window id to write to, which might work out, but I'm not sure which window to tell it to write to. I tried the window id given by xwininfo -root, but that just seemed to result in a very confused X server. Any suggestions?

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Help needed in problem with Threads and sockets.
by Gon�alo Rodrigues Dec. 29, 2003

Dec. 29, 2003

Hi, I have a problem with threads and sockets. I'll try to describe the problem in words with pseudo-code. I've been working on a few classes to make it easier to work with threads. This framework, let us call it that, consists in two parts. The first part is just a basic thread class deriving from threading.Thread with a few extra functionality that makes it easier for a thread to spawn a new thread and "father it". Each of its instances also has a queue.Queue where other threads can post data. The other part is an Event class, whose instances are traded among threads (via their queues). These Event classes also know how to process themselves by calling a sequence of handlers and things are made up in such a way that it's easy to add or remove handlers at runtime. In testing this framework, and also with a mind for future applications, I tried to add sockets to the mix. The basic idea was that a socket was shared among two threads. The *only* job of one of the threads is to listen to the socket and read whatever is there, while the other socket listens to incoming requests (in the form of Event's) like: open the socket, write to the socket, close the socket, kill yourself, etc. For a number of reasons, instead of dealing with sockets directly I found it easier to deal with streams. So I just wrapped the socket in a stream-like class. The stream class is little more than a thin wrapper around socket.makefile(). In fact the whole thing is just: class SocketProxy(object): def __init__(self, sockfile): super(SocketProxy, self).__init__(self) self._sockfile = sockfile def __getattr__(self, attrib): return getattr(self._sockfile, attrib) def write(self, s): self._sockfile.write(s) #Force a flush of the underlying socket. self._sockfile.flush() And it's instantiated as SocketProxy(<some socket>.makefile()). The structure run method of the read thread TReadStream is basically (in pseudo-code and leaving out some gobbledigook dealing with exception handling) while self.exit: <select call with timeout> if <stream is readable>: data = <stream>.read() if data: <push data to parent thread> The select calls with timeout are needed so that we can check the exit flag and have the opportunity to kill the thread. The run method of the write thread TWriteStream is basically: <process a StartStreamEvent event> try: while True: <pop an event from the queue> try: <process event> except Exception, e: <process error event> finally: <process an EndStreamEvent event> Then there is a TStream(TWriteStream) whose only difference from TWriteStream is in __init__ that instantiates a read thread TReadStream and "fathers it" so that the read thread knows where to push the data. Now, all the tests for TReadStream and TWriteStream are passing which means that their basic functionality is working OK. But in testing TStream things fails miserably. The test that fails is basically this: <Write to the stream> <Test that you read back is exactly what you sent.> where the stream wraps a socket connected to an echo server => just echoes back whatever it receives. I added a few print statements here and there and the output I get is: StartStreamEvent(None, priority = 1) Select call. WriteEvent('A test.', priority = 0) Reading data. This means that the following happened: 1. The thread started ok (StartStreamEvent processed). This means that TStream was started and it's child threads (a TReadStream in this case) started. 2. The read thread is about to make a select call. 3. A WriteEvent was processed (=> "A test." was sent to the stream). 4. The select call finished, the stream was readable and we're about to read from the stream. Then things hang up. The read call never finished, the data was not pushed to the TStream, etc. Anybody knows what might be the problem? BTW, this is in Win2K. If you need more accurate descriptions (exact code, etc.) just holler. TIA, With my best regards, G. Rodrigues

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Installing PyOpenGL - can't find libnumarray module
by Steven Gutstein Dec. 29, 2003

Dec. 29, 2003

This is probably a fairly newbie type problem, but I'm trying to use PyOpenGL, and don't seem to have installed it correctly. I'm running Python 2.3 on a Windows NT machine. Whenever I go into IDLE and type from OpenGL.GL import * I get a flagrant crash which shuts down IDLE. The error message I get (as well as I could copy it) is as follows: Traceback (most recent call last): File "C:\Python23\lib\site-packages\Pythonwin\pywin\scintilla\formatter.py", line 222, in OnStyleNeeded notify = self.scintilla.SCIUnpackNotifyMessage(extra) File "C:\Python23\lib\site-packages\Pythonwin\pywin\scintilla\control.py" , line 57, in SCIUnpackNotifyMessage margin = margin) ImportError: No module named libnumarray win32ui: Exception in OnNotify() handler The main problem seems to be the lack of a libnumarray module. However, I have already installed numarray, and have verified that it's in my sys.path: >>> sys.path ['', 'c:\\dislin\\python', 'C:\\WINDOWS\\System32\\python23.zip', 'C:\\Python23\\lib\\site-packages\\Pythonwin', 'C:\\Python23\\lib\\site-packages\\win32', 'C:\\Python23\\lib\\site-packages\\win32\\lib', 'C:\\Python23\\lib\\site-packages', 'C:\\Python23\\DLLs', 'C:\\Python23\\lib', 'C:\\Python23\\lib\\plat-win', 'C:\\Python23\\lib\\lib-tk', 'C:\\Python23', 'C:\\Python23\\Deitel_Examples', 'C:\\Python23\\lib\\site-packages\\Numeric', 'C:\\Python23\\lib\\site-packages\\PIL', 'C:\\Python23\\lib\\site-packages\\gist', 'C:\\Python23\\lib\\site-packages\\numarray', 'C:\\Python23\\lib\\site-packages\\PythonPrograms'] It's the next to last entry. Inside my numarray directory there is a file libnumarray.pyd. I reinstalled numarray & checked the version for Python2.2. All I see in each version is libnumarray.pyd. Is there anything obvious that I'm missing or should try ? Thanks, Steven Gutstein

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