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itertools.filterfalse in Python

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Creates an iterator that filters the elements of the passed object using the specified negation function.

itertools.filterfalse (predicate, iterable)

-> iterator

predicate - Filtering function. Must accept an element of the filtered object. If the function returns True, then this element will not be included in the result. If None is passed, elements evaluating to False will be returned.

iterable - An object whose elements should be filtered by negating. 


Note

The arguments, result and behavior of this function are the same as the filter () in Python 3, except that the elements for which the function from predicate returned False will be left, and if predicate is None then elements evaluating false will be left.


  from itertools import filterfalse 

filtered = filterfalse (None, [1, 0, 2, ’’, 4])
list (filtered) # [0, ’’]

filtered = filterfalse (lambda value: ’a’ in value, [’ ’,’ a’, ’b’,’ fa’])
list (filtered) # [’’, ’b’]

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