functools.partial example

functools_partial_example.py

import functools

def calc(x, y, mode):
    if mode == '+':
        return x + y
    elif mode == '-':
        return x - y
    elif mode == '*':
        return x * y
    elif mode == '/':
        return x / y

def main():
    print '--------- call calc ---------'
    print 'calc(3, 1, "-") = %d' % calc(3, 1, '-')
    print '--------- make minus(x, y) using functools.partial ---------'
    minus = functools.partial(calc, mode='-')
    print 'minus(3, 1) = %d' % minus(3, 1)
    print 'minus(1, 1) = %d' % minus(1, 1)
    print 'minus(7, 9) = %d' % minus(7, 9)

if __name__ == '__main__':
    main()