🌐 Mailman 3 March 2006 - Python-list - python.org

Re: time.sleep(1) sometimes runs for 200 seconds under windows
by Claudio Grondi March 1, 2006

March 1, 2006

Paul Probert wrote: > Peter Hansen wrote: > >> Are you saying that you believe the time.sleep(1) call is actually >> blocking for 200 seconds? Or just that your loop (and we can only >> guess what it looks like) is the one taking that long? >> >> If the former, try something like putting "print 'before'" and "print >> 'after'" before and after the sleep, and observe what happens when you >> run the program. I'm fairly confident in saying there's no chance >> you'll see the "before" sit for 200s before you see the "after" and >> that your problem lies elsewhere, not with time.sleep(1). >> >> If the latter, um, obviously we can't help without more info. >> >> -Peter >> >> >> > Yes, I'm doing this: > ..... > oldtime=time.time() > time.sleep(1) > newtime=time.time() > dt=newtime-oldtime > if dt > 2: > print 'dt=',dt,' time=',time.strftime('%Y_%m_%d_%Hh_%Mm_%Ss') > Its happening roughly 4 times a day total on our 20 machines, ie about > once every 5 days on a given machine. > > Paul Probert > University of Wisconsin > With such rare occurrence it is very hard to tell what is going on. Usually I put such strange things on a list of curiosities I don't want to know the reason of, because it is in my eyes not worth the effort. Maybe it is even a common problem not yet detected by me, because I have never run this kind of tests for such a long time. Starting today, I can tell you statistically not earlier than in one week, if I have the same problem on my machines (currently I am running only one or two at the same time). In between let's try to use some logic: If the machine and the operating system are not the cause, what have all these machines in common? 1. The software they are running (kind of not often triggered bug) 2. The network cards used (bug in hardware or drivers) 3. Another piece of hardware common to all the machines 3. The harddisks (recalibration) 4. The network router/switch and/or the server. Claudio

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Re: An isalpha() that accepts underscores as well
by bearophileHUGS＠lycos.com March 1, 2006

March 1, 2006

This is probably faster: def alfa_(w): return w.replace("_", "a").isalpha() This is another solution, but it's probably slower, you can time it: from string import letters _setalpha = set(letters + "_") def alfa_2(w): return not (set(w) - _setalpha) Bye, bearophile

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C++ OpenGL rendering, wxPython GUI?
by tobfon＠gmail.com March 1, 2006

March 1, 2006

I'm creating a scientific visualization application with rather high demands on performance. I've created a nice rendering engine for it in C++/OpenGL and a python interface to the rendering engine. Now I'm looking to build a GUI in python with the rendering engine as an integrated window. I will most likely use wxPython for the GUI and I know it has support for adding an OpenGL canvas. After looking around in these groups and others it seems to me that most people doing 3D-applications simply opt to use PyOpenGL. Since my application uses VBOs, shader programs and similar things this is not an option for me. My rendering engine currently uses GLUT for window handling, but what I want to do is to create the canvas in python for use with wxPython and then somehow toss it down to C++ for rendering and avoid using GLUT at all. I've yet to come across an example of how this could be done. Maybe including wxWidgets in the C++ program and just using the wxPython-created canvas ID there will somehow be possible? I'll look into that but any help or ideas are most welcome. Tobias Forslöw

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Failing in a simple embedding example of python
by Themistoklis Bourdenas March 1, 2006

March 1, 2006

Hi I'm trying the following simple test in my application: FILE* fp = fopen("test.py", "r"); PyRun_SimpleFile(fp, "test.py"); fclose(fp); However I get seg fault is in PyRun_SimpleFile(fp, "test.py"). "test.py" is an existing file with a simple statement (print 7+4). When I try PyRun_SimpleString("..."); The script is running normally. What is the problem with this one? I don't know if this cause any trouble but I link statically with python. Thank you.

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Re: PEP 354: Enumerations in Python
by Dan Sommers March 1, 2006

March 1, 2006

On Mon, 27 Feb 2006 03:13:08 -0600, Tim Chase <python.list(a)tim.thechases.com> wrote: > Same could go for days of the week: >>>> dow=enum(("sunday", 0), ("monday", 1), > ("start_of_work_week", 1), ... ("friday", 5), > ("end_of_work_week", 5)...) Not really: In some parts of the world, calendar weeks begin on Monday and end on Sunday, and in other parts of the world, work weeks begin on Sunday and end on Thursday. ISTM that if you want to do anything with the value of a given enumeration tag (including make greater/less than comparisons, sort, etc.), then a dictionary might be better than an enum. Also, enumeration tags like "end_of_work_week" should be assigned at run-time based on locale and/or preferences settings (not that you couldn't have stuck the code above into a preferences file...). > Given more little grey cells (or gray cells?), I'm sure I could come > up with more examples of when it's handy to have duplicate values in > an enum... I don't know: If you're using enums as names for otherwise meaningful values, then you're right. But if you're using enums as meaningful names for pairwise distinct concepts, then I think otherwise. IMO, if your program breaks if someone re-assigns the values randomly, then a better solution than an enum exists. (Or maybe that's because I think of the tags as nothing more than keywords that work like distinct values.) Regards, Dan -- Dan Sommers <http://www.tombstonezero.net/dan/> "I wish people would die in alphabetical order." -- My wife, the genealogist

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Re: Fetching the Return results of a spawned Thread
by Alvin A. Delagon March 1, 2006

March 1, 2006

Thanks a lot for the links that you gave me. I will look into that today! :-)

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how do I factor a number down to one digit?
by Allan March 1, 2006

March 1, 2006

I'm trying to write a numerology program where I have each letter identified by a numerical value like a=1 b=2 c=3 as so forth. I then input a name. How do I treat each letter as a single value? That is, instead of print myname I have to do a print m+y+n+a+m+e which returns a number. I next want to convert the resulting two or three digit number to a single digit. Like 123 would be 1+2+3 returning a 5. I hope this isn't too stupid of a question.

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PyPornography was: Re: Python vs. Lisp -- please explain
by Christos Georgiou March 1, 2006

March 1, 2006

On Tue, 21 Feb 2006 15:05:40 -0500, rumours say that Steve Holden <steve(a)holdenweb.com> might have written: >Chris Mellon wrote: >[...] >> Torstens definition isn't useful for quantifying a difference between >> interpeted and compiled - it's a rough sort of feel-test. It's like >> how much of a naked body you can expose before before it changes from >> art to pornography - it's not something that is easily quantified. >> >[...] >Possibly, but if your aim is exposing as much flesh as possible without >being labeled pornography I think I'd conclude you were in the >pornography business from the start, albeit masquerading as an "art dealer". The difference between art and pornography, as I perceive it, is that you don't have to think about it when you see pornography. You can even turn off the audio in cinematographic/video pornography and still the message comes through (in the vague lines of "jerk off along"). So, in pornography there's no interpretation step involved; therefore, by pure logic, all "compiled to machine code" languages should be looked down upon as pornographic, and Python is art. QED. PS You (the READER) are licensed to substitute other "non compiled to machine code" languages for Python (the PROGRAM) in the previous paragraph, just do it outside comp.lang.python (the COMPANY). We don't care what you do late at night with *your* object of desire, whatever that may be, since it's not Python. -- TZOTZIOY, I speak England very best. "Dear Paul, please stop spamming us." The Corinthians

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Re: type = "instance" instead of "dict"
by James Stroud March 1, 2006

March 1, 2006

Fredrik Lundh wrote: > James Stroud wrote: > > >>Perhaps you did not know that you can inheret directly from dict, which >>is the same as {}. For instance: >> >>class Dict({}): >> pass I must have been hallucinating. I swear I did this before and it worked just like class Dict(dict). Since it doesn't read as well, I've never used it. >

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RE: MySQLdb compile error with AMD64
by Keith Burns March 1, 2006

March 1, 2006

Found it. Had to change Extra_compile_args = config(cflags) to the actual list with -march=athlon64 Now just realized that I didn't download the right RPMs for MySQL for SUSE on AMD64 (so got lib errors I am assuming cos of that). Will download and update with what I changed in the setup.py once I get this working. Thanks for the pointers and getting me on the right track! _____________________________________________ From: Keith Burns [mailto:keith@nekotaku.com] Sent: Tuesday, February 28, 2006 8:04 PM To: 'python-list(a)python.org' Subject: MySQLdb compile error with AMD64 >> Can anyone offer any assistance on this one? > >Look here: > >>> gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -fmessage-length=0 -Wall >>> -D_FORTIFY_SOURCE=2 -g -fPIC -I/usr/include/mysql >>> -I/usr/include/python2.4 -c _mysql.c -o >>> build/temp.linux-x86_64-2.4/_mysql.o -I/usr/include/mysql -g >>> -march=i586 -mcpu=i686 -fmessage-length=0 > >specifically at -march=i586. MySQLdb sets CFLAGS which aren't applicable to >your processor, and as such the compile barfs. You should probably just run >it with something like > >CFLAGS="-march=athlon-64" python setup.py build > >I am positive that MySQLdb works on AMD64, I have it running there. Anyway, >the CFLAGS fix should work. Hey there! Appreciate the help but the CFLAGS did not change the gcc -march (I tried it as above and with CFLAGS="-march=athlon64" which I found in a GCC flag FAQ). I realize that the -march is my problem but I can't work out how to change it. Any ideas? Thanks!

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