python - Getting corresponding module from function

Question

I want to modify a module xyz and its functions like that:

def modify(fun):
    modulename = fun.__module__ # this is string. ok, but not enough

import xyz
modify(xzy.test)

My problem is how to access the namespace of xzy inside modify. Sometimes

globals()[fun.__module__]

works. But then I get problems if the definition modify is in a different file than the rest of the code.

Answer 1

Use the inspect module:

import inspect

def modify(fun):
    module = inspect.getmodule(fun)

This is the same as polling the module from sys.modules using fun.__module__. Although getmodule tries harder even if fun does not have a __module__ attribute.