import sys

def add_all(nums):
	return sum(nums)

def multiply_all(nums):
	return reduce(lambda a, b: a * b, nums)

if __name__== '__main__':
	command = sys.argv[1]
	nums = map(float, sys.argv[2:])
	if command == 'add':
		print(add_all(nums))
	elif command == 'multiply':
		print(multiply_all(sums))

import sys

def add_all(nums):
	return sum(nums)

def multiply_all(nums):
	return reduce(lambda a, b: a * b, nums)

if __name__== '__main__':
	command = sys.argv[1]
	nums = map(float, sys.argv[2:])
	if command == 'add':
		print(add_all(nums))
	elif command == 'multiply':
		print(multiply_all(nums))

Fix bug in 'multiply' support