On Sat, Oct 31, 2020 at 9:37 PM Guido van Rossum <[email protected]> wrote:
>
> I think this over-stresses the notion that users might want to override
> the comparison operator to be used. We only have two operators that make
> sense in this context, 'is' and '==', and really, for almost everything you
> want to do, '==' is the appropriate operator. (There is a small trickle of
> bugs caused by people inappropriately using e.g. `if x is 1` instead of `if
> x == 1`, suggesting that if anything, there is too much freedom here.) The
> big exception is `None`, where you basically always want to use `is`, which
> is what PEP 634 does.
>
FWIW, there's an additional exception:
sentinel = object()
if var is sentinel:
I use this idiom from time to time - instead of None.
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