Eric V. Smith <e...@trueblade.com> added the comment:

I don't see how this would be possible in general. What would you do with a 
function call that has side effects?

f'{a()+b+c=}'

?

You'd end up calling a() twice, or inventing your own expression evaluator.

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nosy: +eric.smith

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<https://bugs.python.org/issue43695>
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