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Add operator.is_none() #115808
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- added a commit that references this issue
on Feb 22, 2024 For convenience, it might also be nice to have
is_not_none(). The matches what would be done in a typical list comprehension:cleaned = [x for x in data if x is not None]. Also, it would save the need to know about filterfalse() in itertools module which is less well known that builtin functions. A simple builtin filter() call will suffice:mean(filter(is_not_none, data)).Reacted by Alex Waygood, Waket Zheng and FeuermurmelFor convenience, it might also be nice to have
is_not_none()Agreed -- I was going to suggest this. It also fits the general pattern of the
operatormodule: we have bothis_andis_not, bothtruthandnot_, etc.Reacted by Raymond Hettinger- added a commit that references this issue
on Mar 4, 2024
Feature or enhancement
Proposal:
With floating point data, the
float('NaN')special value is commonly used as a placeholder for missing values. We providemath.isnanto support stripping out those values prior to sorting or summation:For non-float data, the
Nonespecial value is commonly used as a placeholder for missing values. I propose a new function in the operator module analogous tomath.isnan():This helps fulfill a primary use case for the operator module which is to support functional programming with
map(),filter(), etc.Has this already been discussed elsewhere?
No response given
Links to previous discussion of this feature:
No response
Linked PRs
is_noneandis_not_noneoperators #115814