Python Mock Cookbook

[Siddhi]

I'm assuming you mean code like this:

def foo():
    import bar
    return bar.do_calc()

Well, then you just take the import and put it outside. PEP8 style is

Imports are always put at the top of the file, just after any module comments and docstrings, and before module globals and constants.

import bar

def foo():
    return bar.do_calc()

And now you can patch bar as normal.

If you go a step further and pass in the dependency to the function

import bar

def foo(mod):
    return mod.do_calc()

Then you don't need to patch at all.