Pythonにパイプ演算子と関数合成を導入する（仮）

前提

class F:
    def __init__(self, f):
        self.f = f

    def __call__(self, *args, **kwargs):
        return self.f(*args, **kwargs)

    def __mul__(self, other):
        def _f(*args, **kwargs):
            return self.f(other(*args, **kwargs))
        return _f

    def __ror__(self, other):
        return self.f(other)


@F
def f(x):
    return x + 1

@F
def g(x):
    return x * x

帰結

>>> 1 | f
2

>>> 2 | g
4

>>> 1 | f | g
4

>>> (f * g)(1)
2

>>> (g * f)(1)
4