[issue38351] Modernize email example from %-formatting to f-string

[Eric V. Smith]

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

I definitely think we should not modify any code in the stdlib just to switch to f-strings.

I think the code examples in the docs would benefit from a consistent style, and since f-strings are the least verbose way to format strings, I'd endorse using them except where .format or %-formatting is the point of the example.

I agree with Fred that hearing from Julien would be helpful.

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nosy: +eric.smith

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<https://bugs.python.org/issue38351>
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