How to get the current running module path/name

This works for me:

__loader__.fullname

Also if I do python -m b.c from a\ I get 'b.c' as expected.

Not entirely sure what the __loader__ attribute is so let me know if this is no good.

edit: It comes from PEP 302: http://www.python.org/dev/peps/pep-0302/

Interesting snippets from the link:

The load_module() method has a few responsibilities that it must fulfill before it runs any code:

...

• It should add an __loader__ attribute to the module, set to the loader object. This is mostly for introspection, but can be used for importer-specific extras, for example getting data associated with an importer.

So it looks like it should work fine in all cases.

I think you're actually looking for the __name__ special variable. From the Python documentation:

Within a module, the module’s name (as a string) is available as the value of the global variable __name__.

If you run a file directly, this name will __main__. However, if you're in a module (as in the case where you're using the -m flag, or any other import), it will be the complete name of the module.