🌐 Mailman 3 August 2000 - Python-list - python.org

How to use a DocumentTemplate custom format from Python?
by Hamish Lawson Aug. 31, 2000

Aug. 31, 2000

I'm using DocumentTemplate from Python (not in Zope) and I want to use a custom format 'javascript_quote' that I've written. In my DTML file I have: <dtml-var name="name" fmt="javascript_quote"> and in the Python code I have def javascript_quote(s): .... template = DocumentTemplate.HTMLFile( 'page.dtml', {'javascript_quote': javascript_quote} ) print template(None, {'data': data}) But it complains that not everything was converted, presumably because it is trying to interpret the fmt="javascript_quote" as a C-style format. How do I get it to use my function? Hamish Lawson Sent via Deja.com http://www.deja.com/ Before you buy.

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RE: print statement and multithreading
by Matthew Schroeder Aug. 31, 2000

Aug. 31, 2000

that could be, if the IO streams are buffering the output, because they'd flush at different times. In Perl we were able to specify autoflush for the buffers, which would keep them in order, as they wouldn't buffer output then. I don't know if you can do the same in Python though. -----Original Message----- From: Ken Kinder [mailto:kkinder@tridog.com] Sent: Tuesday, August 22, 2000 12:40 PM To: Roy Katz Cc: python-list(a)python.org Subject: Re: print statement and multithreading It should work the same. The only thing you might worry a little about is the order things come out -- sometimes i/o streams seem out of order.

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Problem using popen2/popen3
by jurgen.defurne＠philips.com Aug. 31, 2000

Aug. 31, 2000

I am using these functions to control a separate process, which is done normally through the command line. I have used popen for this, which works fine, but I also want to catch the standard error output. If an error occurs, the exit status is 1 and that's it. Using popen3 I was able to do what I wanted, but from the documentation it is not clear how I can get the exit status (sometimes the result is an error message, but with exit status 0). The documentation on popen2/popen3 is contradictory here. The factory functions popen2/popen3 return 2 or three pipe objects, bot lower in the text it is stated that 'Popen3 instances are created using the factory functions described above'. This seems contradictory to me. Any ideas or explanations ? Jurgen

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test_largefile cause kernel panic in Mac OS X DP4
by Sachin Desai Aug. 31, 2000

Aug. 31, 2000

Has anyone experienced this. I updated my version of python to the latest source from the CVS repository and successfully built it. Upon executing a "make test", my machine ended up in a kernel panic when the test being executed was "test_largefile". My configuration is: Powerbook G3 128M RAM Mac OS X DP4 I guess my next step is to log a bug with Apple.

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Re: Python in game development? + recFib
by tanzer＠swing.co.at Aug. 31, 2000

Aug. 31, 2000

"Darrell Gallion" <darrell(a)dorb.com> wrote: > Hacked up Christian's code to get past the stack limit. > Skipped locking on things like the cache since it's a write once kind of > thing. > Guess hacking can pay off. (snip -- 90 lines of code) There's an easier way: def fibonacci (n, cache = [0L, 1L]) : for i in range (len (cache), n+1) : cache.append (cache [i-1] + cache [i-2]) return cache [n] # end def fibonacci And it's more efficient, too (for n=10000, it's 50% faster than my version with the dict; for n=16383, it's almost 3 times faster than your version). Simple-is-often-faster-than-complex ly, Christian -- Christian Tanzer tanzer(a)swing.co.at Glasauergasse 32 Tel: +43 1 876 62 36 A-1130 Vienna, Austria Fax: +43 1 877 66 92

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Unloading modules
by Rainer Deyke Aug. 31, 2000

Aug. 31, 2000

Simple question: is it possible to unload a module from memory (i.e. let it be garbage collected by letting its reference count reach 0)? -- Rainer Deyke (root(a)rainerdeyke.com) Shareware computer games - http://rainerdeyke.com "In ihren Reihen zu stehen heisst unter Feinden zu kaempfen" - Abigor

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by unknown＠example.com Aug. 31, 2000

Aug. 31, 2000

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Tkinter: passing raw binary data back and forth
by Kevin Russell Aug. 31, 2000

Aug. 31, 2000

I'm helping Kare Sjolander write a Python interface for Snack, his Tcl extension for handling sound. (Prepare to be amazed when it's done :-).) One thing I can't figure out is how to pass raw binary data back and forth between Tcl and Python using Tkinter. Snack has a couple of commands which will take binary data out of a sound object and put it into a Tcl variable and vice versa. I'd like Python to be able to get at this binary data (just in case there are any psychotic users out there who want to do something like write their own wavelet analysis routines in NumPy). Using a StringVar doesn't work. Are there any gurus out there who are intimately familiar with the guts of Tkinter, or maybe PIL gurus who've solved similar problems with visual data? -- Kevin Russell

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NumPy vs. iterative vs. ???
by tim.lavoie＠mts.net Aug. 31, 2000

Aug. 31, 2000

I've been tinkering (no, not TkInter-ing, at least yet) with fractals in Python, but am not sure if my approach is sensible. By the way, I mean iterative-by-nature, Mandelbrot set sort of fractals. I like the idea of NumPy, in that it does a lot for me and makes for more elegant code. However, I'm not sure how well it fits this application, since it prefers to apply each operation to every element in the array. Also, keeping several arrays (some complex-type) for the whole works is very RAM-hungry as well, at an element per pixel per array. I do like the flexibility of doing things like this in Python, for instance I pass the function to iterate as a parameter, and eval() it. Doing things the old, nested-loop and iteration way, I can more easily evaluate the individual elements, and use a *TINY* fraction of the memory. The problem is, I get whacked with function-call overhead, so it all goes from slow to worse. I do like the idea of passing back the raw result data though, so that I can apply different color parameters without re-doing all the basic calculation. I've considered breaking up the data into chunks that I can process in smaller pieces, say a row at a time; would this make more sense than either previous approach? The code which follows started out as Rob Hooft's example from the NumPy demos, further mangled by myself. Ideas, suggestions and outright derision are all ok... Thanks, Tim -- "Now let us peel back the foreskin of misconception and apply the wire brush of enlightenment" -- Geoff Miller #!/usr/bin/env python # # Mandelbrot ASCII-art using Numeric Python 1.0beta1 # # Rob Hooft, 1996. Distribute freely. # # Additional kluges and hackery, Tim Lavoie, 2000 from Numeric import * from NumTut import * import profile def fraccalc(frac='z**2+c',LowX=-2.1, HighX=0.7, LowY=-1.2, HighY=1.2, \ stepx=250, stepy=250, maxiter=30): xx=arange(LowX,HighX,(HighX-LowX)/stepx) yy=arange(HighY,LowY,(LowY-HighY)/stepy)*1j c=ravel(xx+yy[:,NewAxis]) z=zeros(c.shape,Complex) iter_count=resize(array([128]),c.shape) fin = zeros(c.shape) print iter_count.shape, z.shape, c.shape fraccode = compile(frac,'<string>','eval') for iter in range(maxiter): z = where(fin,z,eval(fraccode)) fin = where(greater(abs(z),2.0),1,0) # c=where(finished,0+0j,c) # z=where(finished,0+0j,z) iter_count=where(equal(fin,1), iter_count, iter) # return iter_count.tostring() iter_count = where(equal(fmod (iter_count, 2), 1),0,255) iter_count.shape = (stepy,stepx) z.shape = (stepy,stepx) c.shape = (stepy,stepx) print iter_count.shape, z.shape, c.shape return (iter_count, z, c) if __name__ == "__main__": profile.run('results = fraccalc()') view(results[0]) raw_input()

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Request for Enhancement
by kc5tja＠garnet.armored.net Aug. 31, 2000

Aug. 31, 2000

I have need to process very large text files in Python, but I don't have any idea how long the files are going to be in real-world situations. It is unfortunate that there is no F.eof() function, where F is a Python file. Here's what I *want*: while not F.eof(): l = F.readline() ...process line... As it is, I have to do the following: l_list = F.readlines() #note plural for line in l_list: ... process line ... While this is fine for my test cases, it could consume unacceptable amounts of memory when fed large text files. Thanks. -- KC5TJA/6, DM13, QRP-L #1447 | Official Channel Saint, *Team Amiga* Samuel A. Falvo II | Oceanside, CA |

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