Logging imported Python modules

README.md

Quick idea to understand what modules get imported.

Example:

>>> import importlog

# Run a bunch of code
>>> import shapely.geometry
>>> p = shapely.geometry.Point(0.0, 0.0)
>>> b = p.buffer(1.0)

# See which modules were imported.
>>> importlog.modules
{'array',
 'ctypes',
 'difflib',
 'future_builtins',
 'numbers',
 'numpy',
 'shapely',
 'unittest'}

importlog.py

import sys

modules = set()

class ImportLog(object):
    def find_module(self, fullname, path=None):
        name = fullname.split('.')[0]
        modules.add(name)

        # Returning None just continues import normally
        return None

log = ImportLog()
sys.meta_path = [log]

I wrote a lot of the tests before I got clued in to nose and py.test. It's a standard lib module.