chain_composition.py

class Obj(object):
    def method1(self):
        return do_stuff(self)

    def method2(self):
        return do_other_stuff(self)

    def method3(self):
        return do_more_stuff(self)

result = Obj().method1().method2().method3()

# Equivalent using function composition.

def compose(*funcs):
    return lambda xx: reduce(lambda val, func: func(val), reversed(funcs), xx)

composed = compose(
   Obj.method1,
   Obj.method2,
   Obj.method3
)
result2 = composed(Obj())

assert result == result2