python - 循环回到代码中的特定点

Question

所以我正在编写一个小游戏，我正在尝试做一些我不明白该怎么做的事情。我已经定义了一个函数，当代码工作的任何条件都不满足时，我希望它返回到另一行代码。但我不明白该怎么做。这是我正在处理的代码的一部分

print "What's your favourite type of pokemon?"

fav_type = raw_input()

def chosen_pokemon():
    if "fire" in fav_type:
         print "So you like fire types? I'll give you a chimchar!"
    elif "water" in fav_type:
         print "So you like water types? I'll give you a piplup!"
    elif "grass" in fav_type:
         print "So you like grass types? I'll give you a turtwig!"
    else:
         print "sorry, you can only choose grass, water or fire"
         start()

chosen_pokemon()

就像我想让代码返回到“你最喜欢的口袋妖怪是什么类型？”如果它以其他方式结束，但是如何呢？回答的时候尽量说清楚，因为我才刚开始学编程，对编程几乎一无所知

Answer 1

您可以将 raw_input 步骤带入 while 循环，只有在收到有效响应时才退出。我添加了一些评论来解释发生了什么。

def chosen_pokemon():
    while True: # repeat forever unless it reaches "break" or "return"
        print "What's your favourite type of pokemon?"
        fav_type = raw_input()
        if "fire" in fav_type:
             print "So you like fire types? I'll give you a chimchar!"
        elif "water" in fav_type:
             print "So you like water types? I'll give you a piplup!"
        elif "grass" in fav_type:
             print "So you like grass types? I'll give you a turtwig!"
        else:
             print "sorry, you can only choose grass, water or fire"
             continue # jumps back to the "while True:" line
        return # finished; exit the function.

chosen_pokemon()

输出:

>>> chosen_pokemon()
What's your favourite type of pokemon?
yellow
sorry, you can only choose grass, water or fire
What's your favourite type of pokemon?
grass
So you like grass types? I'll give you a turtwig!
>>> 

这是关于 while 循环的教程。 http://www.tutorialspoint.com/python/python_while_loop.htm