Question

Say I have a package ‘mylibrary’.

I want to make ‘mylibrary.config’ available for import, either as a dynamically created module, or a module imported from an entirely different place that would then basically be ‘mounted’ inside the ‘mylibrary’ namespace.

I.e., I do:

import sys, types sys.modules['mylibrary.config'] = types.ModuleType('config') 

Given that setup:

>>> import mylibrary.config    # -> works  >>> from mylibrary import config <type 'exceptions.ImportError'>: cannot import name config 

Even stranger:

>>> import mylibrary.config as X <type 'exceptions.ImportError'>: cannot import name config 

So it seems that using the direct import works, the other forms do not. Is it possible to make those work as well?

Answer 1

You need to monkey-patch the module not only into sys.modules, but also into its parent module:

>>> import sys,types,xml >>> xml.config = sys.modules['xml.config'] = types.ModuleType('xml.config') >>> import xml.config >>> from xml import config >>> from xml import config as x >>> x <module 'xml.config' (built-in)>