#!/usr/bin/env python
data = {
    "0": "zero",
    "1": "one",
    "2": "two",
    "q": "exit",
}

while True:
    arg = input(">>:")
    v = data.get(arg, "nothing")
    if v == 'exit':  #判断输入的是q取值是exit 退出循环
        break
    else:
        print(v)
exit("程序正在退出")

#!/usr/bin/env python
data = {
    "0": "zero",
    "1": "one",
    "2": "two",
}

while True:
    arg = input(">>:")
    v = data.get(arg, "nothing")
    if v == 'nothing':   #判断字典里面没有对应的键值对 就退出循环
        break
    else:
        print(v)
exit("程序正在退出")