curry.py

#################################################
# currying and partial application in python    #
# based on code from Simon Willison's geocoders #
#################################################

# curries fn, a function of exactly 2 parameters
def partial2(fn):
    def inner1(arg2):
        def inner2(arg1):
            return fn(arg1, arg2)
        return inner2
    return inner1

# a simple function of 2 parameters
def hello(firstname, lastname):
    print "hello %s %s" % (firstname, lastname)

hello = partial2(hello)

# perform partial application of hello, binding only the first argument.
# this prints nothing and returns a curried function of 1 parameter
hello_with_firstname = hello('Mickey')

# bind the final argument, which completes the function application
# and finally prints "hello Mickey Mouse"
hello_with_firstname('Mouse')