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Showing content from https://mail.python.org/pipermail/python-dev/2018-March/152498.html below:

[Python-Dev] Subtle difference between f-strings and str.format()

[Python-Dev] Subtle difference between f-strings and str.format() [Python-Dev] Subtle difference between f-strings and str.format()Tim Peters tim.peters at gmail.com
Wed Mar 28 14:30:04 EDT 2018
[Tim]
> I have a hard time imaging how that could have come to be, but if it's
> true I'd say the unoptimized code was plain wrong.  The dumbest
> possible way to implement `f() and g()` is also the correct ;-) way:
>
> result = f()
> if not bool(result):
>     result = g()

Heh - that's entirely wrong, isn't it?  That's how `or` is implemented ;-)

Same top-level point, though:

result = f()
if bool(result):
    result = g()
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