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

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. <fdrake at gmail.com> added the comment:

I'd like to see consistent usage by default, with specific examples using the older forms as appropriate.  The use cases Raymond identified are worth discussing (and the tutorial may be a good place for this), and well as mentioned in the reference docs for the '%s' % x and ''.format() operations (and string.Template(), of course).

I would not like to see different syntaxes randomly applied to different examples that happen to involve formatting, but where that's not the emphasis.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38351>
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