importissue.py

import importlib
import os
import shutil

testmod = os.path.join(os.path.dirname(__file__), 'testmod')
os.mkdir(testmod)
with open(os.path.join(testmod, '__init__.py'), 'w') as f:
    f.write('pass')

mod1 = os.path.join(testmod, 'mod1')
os.mkdir(mod1)
with open(os.path.join(mod1, '__init__.py'), 'w') as f:
    f.write('pass')
importlib.import_module('testmod.mod1')

mod2 = os.path.join(testmod, 'mod2')
os.mkdir(mod2)
with open(os.path.join(mod2, '__init__.py'), 'w') as f:
    f.write('pass')
try:
    importlib.import_module('testmod.mod2')
finally:
    shutil.rmtree(testmod)