Python advanced features-filter, python-filter

Source: Internet
Author: User

Python advanced features-filter, python-filter

Python built-in function filter is used to filter sequences.

Same as map (): filter () also receives a sequence of functions.

Different from map (): filter () applies the input function to each element in sequence, and determines whether to retain or discard the element based on whether the returned value is True or False.

>>> Def is_odd (n ):... return n % 2 = 1...> list (filter (is_odd, [, 5]) # filter (is_odd, [, 5])
[1, 3, 5]

Remove Spaces

>>> Def not_empty (s ):... return s and s. strip ('')... >>> list (filter (not_empty, ['A', '', 'B', None, 'C','']) ['A', 'B ', 'C']


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