[issue24020] threading.local() must be run at module level (doc improvement)

[Eric Snow]

Eric Snow added the comment:

Think of threading.local this way: instances of threading.local are shared between all the threads, but the effective "__dict__" of each instance is per-thread.  Basically, the object stores a dict for each thread.  In __getattribute__, __setattr__, and __delattr__ it swaps the dict for the current thread into place and then does proceeds normally.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24020>
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