def display():#无参数	print("No")	return# display()def callfun():#调用	print("2")	display()	returncallfun()def message(name): #一个参数	print('Hello:'+name)	returnmessage('NanJing')#调用message('BeiJing')def message(greeting,name):#两个参数	return greeting+","+namemsg=message('Hello','Jack')show=message('Hello','Ma')print(msg)#调用print(show)def Add(a,b):#两参数	c=int(a)+int(b)	print(c)	returnAdd(10,20)#调用