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28.03.18 22:05, Paul Moore пише

I can't imagine (non-contrived) code where the fact that a is  
formatted before b is evaluated would matter, so I'm fine with option  
3.

If formatting a and evaluating b both raise exceptions, the resulting exception depends on the order.

$ ./python -bb
\>>> a = b'bytes'
\>>> '{}{}'.format(a, b)
Traceback (most recent call last):
File "", line 1, in
NameError: name 'b' is not defined
\>>> f'{a}{b}'
Traceback (most recent call last):
File "", line 1, in
BytesWarning: str() on a bytes instance