[Python] Finding imports of a function globally

I am working on a test fixture for the slash framework which needs to modify the behavior of time.sleep. For reasons I cannot use pytest, so I am trying to roll my own basic monkeypatching support.

I am able to replace time.sleep easily enough for things that just import time, but some things do from time import sleep before my fixture is instantiated. So far I'm using gc.get_referrers to track down any references to sleep before replacing them:

self._real_sleep = time.sleep
for ref in gc.get_referrers(time.sleep):
if (isinstance(ref, dict)
and "__name__" in ref
and "sleep" in ref
and ref["sleep"] is self._real_sleep):
self._monkey_patch(ref)


In practice this works, but it feels very ugly. I do have access to reasonably current python (currently on 3.11), just limited ability to add 3rd party dependencies. Is there a better/safer way to find references to a thing or to patch out a thing globally, using only standard library methods?

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