Eric V. Smith added the comment:
> And the expected performance for optimal `f'X is {x}'` code would
> be *faster* than `"'X is %s' % (x,)"` which still needs to
> interpret the string at runtime, and build a proper tuple object
> on stack.
That's not necessarily true. The f-string version still needs to invoke the
.format() method on the object, instead of only working for a handful of
hard-coded types.
I'm not saying there aren't optimization opportunities, but it may be that
%-formatting is always faster.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27078>
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