简单的while循环，直到在Python中中断

Question

while在用户键入“ exit”之前，将继续执行下面的程序是一个非常简单的循环语句？

例如，

while response = (!'exit')
    continue file
else
    break
    print ('Thank you, good bye!')
#I know this is completely wrong, but it's a try!

到目前为止，我的档案：

#!/usr/bin/python
friends = {'John' : {'phone' : '0401',
        'birthday' : '31 July',
        'address' : 'UK',
        'interests' : ['a', 'b', 'c']},
    'Harry' : {'phone' : '0402',
        'birthday' : '2 August',
        'address' : 'Hungary',
        'interests' : ['d', 'e', 'f']}}
response = raw_input("Please enter search criteria, or type 'exit' to exit the program: ").split()
try:
    print "%s's %s is %s" % (response[0], response[1], friends[response[0]][response[1]])
except KeyError:
    print "Sorry, I don't know about that. Please try again, or type 'exit' to leave the program: "

Answer 1

您的while循环将继续，直到您设置的条件为false。因此，您希望您的代码大部分位于此循环内。完成后，您知道用户输入了“退出”，因此您可以打印错误消息。

#!/usr/bin/python
friends = {'John' : {'phone' : '0401',
        'birthday' : '31 July',
        'address' : 'UK',
        'interests' : ['a', 'b', 'c']},
    'Harry' : {'phone' : '0402',
        'birthday' : '2 August',
        'address' : 'Hungary',
        'interests' : ['d', 'e', 'f']}}

response = ['']
error_message = "Sorry, I don't know about that. Please try again, or type 'exit' to leave the program: "

while response[0] != 'exit':
    response = raw_input("Please enter search criteria, or type 'exit' to exit the program: ").split()
    try:
        print "%s's %s is %s" % (response[0], response[1], friends[response[0]][response[1]])
    except KeyError:
        print error_message
    except IndexError:
        print error_message

print ('Thank you, good bye!')

这段代码是您想要的代码的开始，但是仍然存在一些错误。查看您是否可以对其进行重组，以便在用户输入“退出”时不显示错误消息。