Python functional composition

gistfile1.txt

class composable:
    def __init__(self, func):
        self.func = func
    
    def __call__(self, *args, **kwargs):
        return self.func(*args, **kwargs)
    
    def __or__(self, other):
        return lambda *args, **kwargs: self(other(*args, **kwargs))
    
    def __ror__(self, other):
        return lambda *args, **kwargs: other(self(*args, **kwargs))
    
    

@composable
def a(x):
    return x + x

@composable
def b(x):
    return '{0}{0}'.format(x)

@composable
def c(x):
    return '-{}-'.format(x)

d = c | b | a
d(2)