mhearne808[insert-at-sign-here]gmail[insert-dot-here]com wrote:
> I have an application where I would like to append to the python path
> dynamically. Below is a test script I wrote. Here's what I thought
> would happen:
>
> 1) I run this script in a folder that is NOT already in PYTHONPATH
> 2) The script creates a subfolder called foo.
> 3) The script creates a file called foo.py, with a foo() method
> defined in it.
> 4) The script attempts to import this module, which fails because the
> current folder is not in PYTHONPATH.
> 5) The script then adds the current folder to the end of sys.path
> 6) The script again attempts to import foo.foo, and succeeds.
>
> #6 never happens, but I can't figure out why. I'm running on Mac OS
> 10.5, with python 2.5.1.
>
> Anybody have any tips?
>
> Thanks,
>
> Mike
>
> Here's the script:
> #!/usr/bin/python
>
> import sys
> import os.path
>
> txt = 'def foo(): print "Hello world!"\n'
> if not os.path.isdir('foo'):
Here you add a directory under the current working directory.
> os.mkdir('foo')
> f = open('foo/foo.py','wt')
> f.write(txt)
> f.close()
To turn the foo directory into a package you must also create a file
foo/__init__.py (may be empty).
>
> try:
> __import__('foo.foo')
> except ImportError:
> homedir = os.path.abspath(sys.path[0]) #where is this script?
> print 'Adding %s to sys.path' % (homedir)
> sys.path.append(homedir)
Here you add the directory to the path were the script is located, not the
cwd. Should be
sys.path.append(".")
> try:
> __import__('foo.foo')
> print 'Import now successful'
> except ImportError:
> print "Why didn't this work?"
> sys.exit(1)
Peter
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