Usage of partials

functools_partials.py

'''
This is an example of functools.partials
Typical usage is when you have a function that needs multiple parameters, 
of which one is a constant, you can use a partial.
Example:
Return only the values in an iterable which match the regex 'c.t' where . is a single character.

Input:
['cat', 'cut', 'abc', 'def']

Output:
['cat', 'cut']
'''

import re
import functools


def re_match(pattern, val):
    return True if re.match(pattern, val) else False
    
def match_filter(arr, pattern):
    if not arr:
        return None

    re_match_partial = functools.partial(re_match, pattern)
    x = filter(re_match_partial, arr)
    print x


match_filter(['cat', 'cut', 'abc', 'def'], 'c.t')