complement¶
- class iteration_utilities.complement(func)¶
Invert a predicate function. There is a homonymous function in the toolz package ([0]) but significantly modified.
- Parameters:
- funccallable
The function to complement.
- Returns:
- complemented_funccallable
The complement to func.
References
Examples
complement is equivalent to
lambda x: not x()
but significantly faster:>>> from iteration_utilities import complement >>> from iteration_utilities import is_None >>> is_not_None = complement(is_None) >>> list(filter(is_not_None, [1,2,None,3,4,None])) [1, 2, 3, 4]
Note
The example code could also be done with
itertools.filterfalse()
oriteration_utilities.is_not_None()
.- func¶
(callable) The function that is complemented (readonly).
New in version 0.6.