Raymond Hettinger <[email protected]> added the comment:
> Eric is absolutely right, due to function calls being
> somewhat slow in Python the performance argument in
> practice falls in favor of f-strings.
Also f-strings can evaluate expressions in the template which is also a big win:
f('Pending {len(req)} requests: {req[0]!r} ... {req[-1]!r}')
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nosy: +rhettinger
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<https://bugs.python.org/issue46200>
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