curry.py

"""
Simple example of currying and creating higher-order functions
in Python.

Taken from 
https://stackoverflow.com/questions/24881604/when-should-i-use-function-currying-in-python
"""

def curry2(f):
    """
    Returns a function g such that g(x)(y) == f(x, y)

    >>> from operator import add
    >>> add_three = curry2(add)(3)
    >>> add_three(4)
    """
    def g(x):
        def h(y):
            return f(x, y)
        return h
    return g