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My base idea would be some unittests for the function like:
class ExtendPathBaseTests(unittest.TestCase):
 def test_input_string(self):
 path = 'path'
 name = 'foo'
 self.assertEqual('path', pkgutil.extend_path(path, name))
 def test_parent_package_raise_key_error(self):
 path = ['path']
 # sys.modules['foo'] raise KeyError
 name = 'foo.bar'
 self.assertEqual(['path'], pkgutil.extend_path(path, name))
 def test_parent_package_raise_attr_error(self):
 path = ['path']
 # datetime module don't have __path__ attr
 name = 'datetime.date'
 self.assertEqual(['path'], pkgutil.extend_path(path, name))
I would move forward if we agreed.