Question

所以我有这个问题，while循环不会破坏：

print 'Enter your chosen email below!'
def valid_email(mail):
    email = mail[-len('@gmail.com'):len(mail)]
    failled = mail[0:-len('@gmail.com')]
    condition = True
    while condition:
        for a in mail:
           if a == ' ':
                print 'Try again'
                condition = False

        if email == '@gmail.com':
            print 'You have succesfully logged in our website!'
            break
        else:
            print 'Did you mean ' + failled + 'gmail.com'
        break

print valid_email('eq@gmai l.com')

我得到输出：

Enter your chosen email below!
Try again
Did you mean eq@gmail.com

我预料到：

Enter your chosen email below!
Try again

感谢您的时间！

Answer 1

如果您只是想删除空格，那么我建议使用str.replace（＆＃34;＆＃34;，＆＃34;＆＃34;）（其中str =电子邮件地址）

Answer 2

尝试使用in代替for循环：

if ' ' in email:
    break

当你进入for循环时，你只是打破了那个循环而不是while循环。

Answer 3

https://docs.python.org/2/tutorial/controlflow.html#break-and-continue-statements-and-else-clauses-on-loops

＆＃34; break语句与C语句一样，突破了最小的封闭for或while循环。＆＃34;

你正在打破for循环，而不是while循环。我认为这样做你想要的：

print 'Enter your chosen email below!'
def valid_email(mail):
    email = mail[-len('@gmail.com'):len(mail)]
    failled = mail[0:-len('@gmail.com')]

    if ' ' in mail:
        print 'Try again'

    if email == '@gmail.com':
        print 'You have succesfully logged in our website!'
    else:
        print 'Did you mean ' + failled + 'gmail.com'

print valid_email('eq@gmai l.com')

while循环不会破坏，python

3 个答案: