operate

from functools import reduce


def operate(operator, *args):
    if operator == '+':
        return reduce(lambda x, y: x + y, args)
    elif operator == '-':
        return reduce(lambda x, y: x - y, args)
    elif operator == '*':
        return reduce(lambda x, y: x * y, args)
    elif operator == '/' and 0 not in args:
        return reduce(lambda x, y: x / y, args)


print(operate("+", 1, 2, 3))