[issue38500] Provide a way to get/set PyInterpreterState.frame_eval without needing to access interpreter internals

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

@greg I hope this goes into 3.8.1 since it was a breaking change.

@victor if we are going to ask folks to start using a setter and getter I say we might as well get it right the first time and start taking the tstate now.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38500>
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