GCD and LCM in python for list

gcd_lcm_list.py

#!/usr/bin/env python3
from math import gcd
from functools import reduce

def lcm(a, b):
    """lowest common multiple of a and b"""
    return int(a * b / gcd(a, b))

def gcd_from_list(arr):
    """Calculate greatest common divisor from list"""
    return reduce(gcd, arr)

def lcm_from_list(arr):
    """Calculate lowest common multiple from list"""
    return reduce(lcm, arr)