pipe.py

from functools import partial

class Infix(object):

    def __init__(self, func):
        self.func = func

    def __or__(self, other):
        return self.func(other)

    def __ror__(self, other):
        return Infix(partial(self.func, other))

    def __call__(self, v1, v2):
        return self.func(v1, v2)


@Infix
def P(x, f):
    return f(x)


def inc(x):
    return x + 1


def dec(x):
    return x - 1


def square(x):
    return x ** 2


print 5 |P| inc |P| dec |P| square