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> What do you mean? The intent was to use poll() instead of select() 
> anywhere available in order to avoid running out of fds.
> The change didn't affect Windows because as of right now select() is 
> the only thing available.
The change *only* effects Windows. Currently the code goes
 if sys.platform != 'win32':
 ...
 else:
 if hasattr(select, 'poll'):
 def _poll(fds, timeout):
 ...
 else:
 def _poll(fds, timeout):
 ...
So _poll() is only defined when sys.platform == 'win32'.
Furthermore, the _poll() function is never used anywhere: ConnectionBase.poll() uses Connection._poll(), which uses wait(), which uses select().