how do "real" python programmers work?
twic at urchin.earth.li
Fri Jan 13 00:10:24 CET 2006
On Thu, 12 Jan 2006, bblais wrote:
> In Matlab, I do much the same thing, except there is no compile phase. I
> have the editor on one window, the Matlab interactive shell in the
> other. I often make a bunch of small scripts for exploration of a
> problem, before writing any larger apps. I go back and forth editing
> the current file, and then running it directly (Matlab looks at the time
> stamp, and automagically reloads the script when I modify it).
I wouldn't describe myself as an experienced programmer, but this is
definitely how i work - editor plus interactive interpreter, using
import/reload to bring in and play with bits of of code.
Towards the end of coding a program, when i'm done with the inner
functions and am working on the main function, which does stuff like
command line parsing, setting up input and output, etc, i'll often leave
the interpreter and work from the OS shell, since that's the proper
environment for a whole program.
Often, i'll actually have more than one shell open - generally three: one
with an interpreter without my code loaded, for doing general exploratory
programming, testing code fragments, doing sums, etc; one with an
interpreter with my code loaded, for testing individual components of the
code, and one at the OS shell, for doing whole-program tests, firing up
editors, general shell work, etc.
Another trick is to write lightweight tests as functions in the
interpreter-with-code-loaded that reload my module and then do something
with it. For example, for testing my (entirely fictional) video
compressor, i might write:
seq = vidzip.ImageSequence((640, 480))
for i in xrange(200):
frameName = "testmovie.%02i.png" % i
frame = Image.open(frameName)
codec = vidzip.Compressor(vidzip.DIRAC, 9)
codec.compress(seq, file("testmovie.bbc", "w"))
Then, after editing and saving my code, i can just enter
"testcompressor()" (or, in most cases, hit up-arrow and return) to reload
and test. You can obviously extend this a bit to make the test routine
take parameters which control the nature of the test, so you can easily
test a range of things, and you can have multiple different test on the go
Only men's minds could have mapped into abstraction such a territory
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