how to let argument be optional falling back to certain integer
Python
python at python.invalid
Sat Jun 20 13:30:13 EDT 2020
Le 20/06/2020 à 18:23, Stefan Ram a écrit :
> Boris Dorestand <bdorestand at example.com> writes:
>> def f(y, N, k = None):
>> k = k or (N - 1)
>> return k
>> I was surprised to find out that 0 == False, so f(7, 31, 0) produces 31.
>
> bool is a subtype of int.
>
>> I'd like 0 to be a valid choice for k.
>
> k = N-1 if k==None else k
When comparing wih None "is" is preferred to ==
k = N - 1 if k is None else k
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