Chris Withers <ch...@withers.org> added the comment:

The tough one is that no-one wants an ugly sys._getframe() call, but by 
avoiding it in the standard library, we force each library that needs this to 
have the ugly sys._getframe() call rather than it being an unpleasant 
implementation detail of get_type_hints that users of the function don't have 
to know about.

That said, I've only hit this so far when writing a unit test, but will update 
this issue if I see real-world cases of this.

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<https://bugs.python.org/issue41872>
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