Create a compose function similar to rambda.js's compose function

composer.py

from functools import reduce, partial
import random
import math


def calcMean(iterable):
    return sum(iterable) / len(iterable)


def formatMean(mean):
    return round(float(mean), 2)


def adder(val, value):
    return val + value


def multiplier(val, value):
    return val * value


def isEven(val):
    return val % 2 == 0


def compose(*fargs):
    if not all(callable(f) for f in fargs):
        raise TypeError("Function is not callable")
    def inner(arg):
        return reduce(lambda arg, func: func(arg), fargs, arg)
    return inner


if __name__ == '__main__':
    # Ex1
    rand_range = [random.randint(0, 10000) for x in range(0, 10000)]

    isRandIntEven = compose(calcMean, formatMean,
                            partial(adder, value=0), math.floor.__call__, isEven)

    print(isRandIntEven(rand_range))

    # Ex2
    classyGreeting = lambda firstName, lastName: "The name's " + \
        lastName + ", " + firstName + " " + lastName
    yellGreeting = compose(partial(
        classyGreeting, "James".upper()), str.upper.__call__)

    print(yellGreeting("Bond"))

    # Ex3
    print(compose(partial(multiplier, value=2),
                  partial(adder, value=1),
                  math.fabs)(-4))