简单的用户交互例:
death_age = 80
name = input("your name:")
age = input("your age:") #input 接受的所有数据都是字符串,即便你输入的是数字,但依然会被当成字符串来处理
print( type(age) )
#int integer =整数 把字符串转成int,用int(被转的数据)
#str string =字符串 把数据转成字符串用str(被转的数据)
print("Your name:",name)
#print("You can still live for ", death_age - int(age)," years ....")
print("You can still live for " + str(death_age - int(age)) +" years ....")