[issue36817] Add = to f-strings for easier debugging.

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

The most recent version of the PR 0ec4daead4d5b3c42613bd210a51da60932035f3 has the behavior without !f and auto-selecting what used to be !f. It's ready for a final review before I commit it.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36817>
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