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2015-08-16 7:21 GMT-07:00 Paul Moore <p.f.moore@gmail.com>:
2. By far and away the most common use for me would be things like print(f"Iteration {n}: Took {end-start) seconds"). At the moment I use str,format() for this, and it's annoyingly verbose. This would be a big win, and I'm +1 on the PEP for this specific reason.
You can use a temporary variable, it's not much longer: print("Iteration {n}: Took {dt) seconds".format(n=n, dt=end-start)) becomes dt = end - start print(f"Iteration {n}: Took {dt) seconds")
3. All of the complex examples look scary, but in practice I wouldn't write stuff like that - why would anyone do so unless they were being deliberately obscure?
I'm quite sure that users will write complex code in f-strings. I vote -1 on the current PEP because of the support of Python code in f-string, but +1 on a PEP without Python code. Victor