[issue41411] Improve and consolidate f-strings docs

[Eric V. Smith]

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

I think this is an excellent idea. The main f-string docs being in a section titled "Lexical Analysis" never seemed very user-friendly.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41411>
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