Greatest Common Divisor function with multiple arguments in python

import math 

import fractions

def gcdm(*args):

    UaS = sorted(list(set(list(args))))

    if len(UaS) == 1:

        return list(UaS)[0]

    if len(UaS) == 2:

        return fractions.gcd(UaS[0],UaS[1])

    if len(UaS) >= 3:

        pair = fractions.gcd(UaS[0],UaS[1])

        print(pair)

        for i in range(2,len(UaS)):

            pair = fractions.gcd(pair,UaS[i])

        return pair

    return 0

print(gcdm(10,20,30,40,50)) == 10

You can do it with fractions or math module which both have gcd function.