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

Best way to have a for-loop index?
by andrewfelch＠gmail.com April 6, 2006

April 6, 2006

I write a lot of code that looks like this: for myElement, elementIndex in zip( elementList, range(len(elementList))): print "myElement ", myElement, " at index: ",elementIndex My question is, is there a better, cleaner, or easier way to get at the element in a list AND the index of a loop than this? TIA, Andrew

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OT: unix newbie questions
by Gerard Flanagan April 5, 2006

April 5, 2006

Hello all Some basic unix questions which pure laziness prevents me from googling for. Anyone feeling charitable? I'm using FreeBSD 6.0: * To create an empty __init__.py file I do 'vim __init__.py' then immediately exit vim, is there a shell or vim command which will create an empty file without opening the editor? * If I want to do : mv mypackage-1.0.2.tar.gz subdir/mypackage-1.0.2.tar.gz then tab-completion gives me the first occurrence of the file, but I have to type the second occurrence - is there a way of not having to type it? * cd ~ brings me to my home directory, is there a means by which I can set up a similar alias for, say, /usr/local/www, so I can do: eg. cd ^ to get to that directory? * I'm using the tcsh shell and have no problems with it, but bash seems more popular - any reason to change? (I don't intend writing many shell scripts) * Any other unix/vim tips for a 'nix newb?! Thanks in advance Gerard

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problems with looping, i suppose
by John Salerno April 5, 2006

April 5, 2006

Here's an exercise I was doing to guess a number from 1-100. Just for fun (ha ha) I decided to add some error checking too, and now when I run it, the DOS prompt flashes real quick and disappears. At first, I had just the top try/except block and not the second one, and that worked (as far as it would work), but after adding the second try/except, it has this problem. I'm sure it has something to do with the looping and the breaks/continues. I'd appreciate any help on this, and also any suggestions for programs that let you step through code to debug it (I'm used to Visual Studio). I have SPE installed at home, but not here at work so I can't try it right now. I assume it has a debugger. Thanks.

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running IDLE from another program?
by John Salerno April 4, 2006

April 4, 2006

If I want to write my code in a separate text editor (I like UltraEdit) but then press a single button to have that code run in the IDLE environment, is that possible? I know that you can configure UE to run external tools, but I can't figure out how to run IDLE this way, because when I check on its properties to find it's file path, it is just the Python directory itself. So not only do I not know where to find the actual file to run IDLE (if possible), but I then don't know how to run my code in IDLE (again, if possible). I guess I could write a script or macro that opens IDLE with a new code window ready, copies and pastes my code from UE into this window, then runs that code, but that seems messy, if that would even work. And wouldn't it also prompt me to save the file before running it in IDLE anyway? So it comes down to this: is it possible to run code (that was created in a separate editor) in IDLE in some kind of automated way?

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COM server / COM client
by Dan April 4, 2006

April 4, 2006

Does the COM server created with python have to be compiled? I have the need to integrate database access but, I can not have any proprietary software. Meaning no compiled programs built by me. So, if python can do com clients and servers without compiling, Im good. But I don't know if that is possible. The ctypes example implies that it must be compiled using py2exe. I know the clients don't have to be compiled. What about the server?

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how to comment lot of lines in python
by diffuser78＠gmail.com April 4, 2006

April 4, 2006

Like in C we comment like /* Bunch of lines of code */ Should we use docstring """ """ Or there is something else too ?? Every help is appreciated. Thanks

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Find similar images using python
by Thomas W April 4, 2006

April 4, 2006

How can I use python to find images that looks quite similar? Thought I'd scale the images down to 32x32 and convert it to use a standard palette of 256 colors then compare the result pixel for pixel etc, but it seems as if this would take a very long time to do when processing lots of images. Any hint/clue on this subject would be appreciated. Best regards, Thomas

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Re: Newbie: splitting dictionary definition across two .py files
by Karthik Gurusamy April 3, 2006

April 3, 2006

Ben Finney wrote: > kar1107(a)gmail.com writes: > > > I'm fairly new to python. I like to define a big dictionary in two > > files and use it my main file, build.py > > > > I want the definition to go into build_cfg.py and build_cfg_static.py. > > That sounds like a very confusing architecture, and smells very much > like some kind of premature optimisation. What leads you to that > design? It's very likely a better design can be suggested to meet your > actual requirements. I work in a source tree of 100s of .c files. The make file builds the various .o files from the .c files. It takes a while to finish on the first run. When I make changes to a .c file, I need to compile to get the .o and also quickly fix any compilation errors. I don't want to use the make infrastructure, as it takes a while to resolve the dependencies. So effectively I'm writing a python script as a poor man's make file. On the first run of make, I capture the complete stdout. Then use a script (another python one - build_generate.py) to grep thru' the makefile's log to find out the exact gcc command used to get a foo.o from its foo.c The script also captures the current working directory -- the make is kind enough to spit out stuff like 'Entering directory /blah/blah/path/to/binary....' It puts out the output in build_cfg.py (it outputs in stdout, which I redirect) I could get results of about 0.20 second completion for a .o file, when the make file easily takes about 20 sec; that's a 100 times speedup. I'm interested in only a few dozen .o files that I manage. So I run the script to generate a dictionary of the form target_db['foo.o'] = { 'cmd_cwd': r'/blah/blah/path/to/binary', 'cmd_str': r'/path/to/gcc <tons of options> -o obj-xyz/foo.o ../blah/foo.c', #'redirect': 1, # I can add any other flags I may think of # In fact I'm planning to make the cmd_str as a list so that I can # run a series of commands } In my build.py based on the target I give on command line (build.py foo.o), I find the dictionary entry and using popen2.Popen3, execute the corresponding cmd_str. Now for every new source tree I pull or when make-file changes, I want to rerun the script to generate the new dictionary. I found build.py can also be used to automate other tasks - say pulling a source tree. In general to run any command (or list of commands that you issue from the shell prompt). These other tasks dictionary entries are static; they don't change when makefiles options changes. That is the reason I want to split the dictionary contents in two files. I only have to change build_cfg.py everytime make-file changes/I use a new source tree. I'm not really worried about optimizations at this time; just want a cleaner solution to my problem. Karthik > > -- > \ "If you can't annoy somebody there is little point in writing." | > `\ -- Kingsley Amis | > _o__) | > Ben Finney

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Difference between 'is' and '=='
by mwql April 3, 2006

April 3, 2006

Hey guys, this maybe a stupid question, but I can't seem to find the result anywhere online. When is the right time to use 'is' and when should we use '=='? Thanks alot~

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Credit card API Sol with python interface
by Sakcee April 2, 2006

April 2, 2006

Hi does anybody know of any credit card merchant slution with python API. we used to use cybercash long time ago, but are willing to switch to something good and not pricy. we want to accept credit cards and process them. something with python wrapper will be great , as I would not have to build urllib wrappers around its functions. thanks

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