f

f.py

from functools import partial


class F:
    __slots__ = ('fns',)
    
    def __init__(self, *fns):
        self.fns = fns

    def __call__(self, *args, **kwargs):
        fns = iter(self.fns)
        for f in fns:
            res = f(*args, **kwargs)
            for f in fns:
                res = f(res)
            return res
        return F(partial(*args, **kwargs))

    def rcompose(self, *fns):
        return F(*self.fns, *fns)
    
    def compose(self, *fns):
        return F(*reversed(fns), *self.fns)
    
    c = comp = __lshift__ = compose
    rc = rcomp = __rshift__ = rcompose

    def __repr__(self):
        return f'F{self.fns!r}'

f = F()