import pdb
import sys

def add(num1=0, num2=0):
	return int(num1) + int(num2)

def sub(num1=0, num2=0):
	return int(num1) - int(num2)

def main():
	print(sys.argv)
	#设置断点
	pdb.set_trace()
	
	addition = add(sys.argv[1],sys.argv[2])
	print(addition)
	subtraction = sub(sys.argv[1],sys.argv[2])
	print(subtraction)

	
main()