module path:funny bug, funny solution

[Pierre Imbaud]

I run into a funny bug, working on a python script, importing modules
laying in the same directory. The script performed some chdir. I debug
under xemacs, executing the script with py-execute-buffer. At some
point, I had to modify an imported module: I put a reload(module) in
the code: surprise! raises a "ImportError: No module named xx"!
what happens is quite simple: sys.path[0] is '', that means: first
search for modules in the current directory. First time, modules are
found ok. when trying to reload, the current directory has changed!
Now, I think its funny. I didnt when it happened.

The solution I found? between import os and import custom modules:

try:
    os.chdir(startDirectory)            # succeeds at subsequent runs
except:
    startDirectory = os.getcwd()        # run at first run.

well, it works, but may I let such a puzzle in my code? The
unadvertized reader will think Im plain mad...

-- 
Pierre Imbaud <pierre at saiph.com>
12 Rue des Bosquets 91480 Quincy Sous Sénart France
Tel:  01 69 00 94 57 Fax 79 65