"dummy_threading" --- Drop-in replacement for the "threading" module
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**Source code:** Lib/dummy_threading.py

3.7 版後已棄用: Python now always has threading enabled.  Please use
"threading" instead.

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This module provides a duplicate interface to the "threading" module.
It was meant to be imported when the "_thread" module was not provided
on a platform.

Be careful to not use this module where deadlock might occur from a
thread being created that blocks waiting for another thread to be
created.  This often occurs with blocking I/O.
