List of modules available for import inside Python?

[Gabriel Genellina]

En Sat, 06 Sep 2008 17:18:55 -0300, clurker <nospam at spamhaters.com> escribió:

> Michele Simionato wrote:
>
>> On Aug 28, 6:21 am, ssecorp <circularf... at gmail.com> wrote:
>>> Is there a way to view all the modules I have available for import
>>> from within Python?
>>> Like writing in the interpreter:
>>
>> Try:
>>
>>>>> help()
>> help> modules
>> Please wait a moment while I gather a list of all available modules...
>> <snip>
>
> This looks like it could be a useful tool, but when I try it
> I get the following:
>
> Please wait a moment while I gather a list of all available modules...
[...]
>   File "/usr/local/lib/python2.5/site-packages/PIL/__init__.py", line 1342,
> in <module>
>
>   File "/usr/local/lib/python2.5/site-packages/PIL/__init__.py", line 927,
> in main
>
> UnboundLocalError: local variable 'given_files' referenced before assignment
>>>>

Unfortunately the "modules" help command actually imports all the available packages, and a buggy one may stop the whole process with an error.

> Apparently python knows about them both, but I don't know I
> haven't introduced an incompatibility somewhere...and that PIL
> package showing up at the tail of the errors was one of my
> more recent additions...

If import of a package fails, the error reported is not accurate. In this case, probably some other package failed, that itself imported PIL. Line 927 in PIL/__init__.py does not exist.

A quick fix is to replace line 1854 in pydoc.py (ModuleScanner.run) with this one:

        for importer, modname, ispkg in pkgutil.walk_packages(onerror=lambda name:None):

(the onerror argument makes it to ignore all errors)

-- 
Gabriel Genellina