verify that the threading module come from the stdlib

eventlet_threading.py

import eventlet
import threading

eventlet.monkey_patch()

print(threading.current_thread.__module__)
# Will print "eventlet.green.threading"
assert threading.current_thread.__module__ == 'threading'
# Will raise the following assertion error:
# Traceback (most recent call last):
#  File "eventlet_threading.py", line 13, in <module>
#    assert threading.current_thread.__module__ == 'threading'
# AssertionError