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if module was marked as not existing by setting sys.modules [fullname] to None, then pkgutil.get_loader (fullname) will throw AttributeError.
Example:
#! /usr/bin/evn python
import unittest
import pkgutil
def main ():
 pkgutil.get_loader ('unittest.functools')
if __name__ == '__main__':
 main ()
Patch is attached