Question

我对如何允许用户重新在Python中输入内容感到困惑。我在下面创建了一个示例代码。我希望如此，如果用户输入1或2以外的无效答案，则允许他们再试一次。

import sys

def start():
    print "Hello whats your name?"
    username = raw_input("> ")
    print "Okay, welcome to the game %s" % username
    print "Do you want to hear the background of the game?"
    print "1. Yes"
    print "2. No"

    background = raw_input("> ")

    if background == "1":
            print "Background goes here."

    elif background == "2":
        print "Background skipped"
start()

如何在此示例中加入try again选项？谢谢！

Answer 1

使用while循环：

def start():
    print "Hello whats your name?"
    username = raw_input("> ")
    print "Okay, welcome to the game %s" % username
    print "Do you want to hear the background of the game?"
    print "1. Yes"
    print "2. No"
    while True:                            # Repeat the following block of code infinitely
        background = raw_input("> ")

        if background == "1":
            print "Background goes here."
            break                            # Break out of loop if we get valid input
        elif background == "2":
            print "Background skipped"
            break                            # Break out of loop if we get valid input
        else:
            print "Invalid input. Please enter either '1' or '2'"   # From here, program jumps back to the beginning of the loop

start()

你将如何创建一个在Python中重试的选项？

1 个答案: