You could automatically check that a user name or email address is not already in use, validate the form without refreshing the page, or even submit the form and display a result dynamically.
可以自动检查一个用户名或电子邮件地址是否已经不再使用，验证表单而无需刷新页面，甚至提交表单并动态显示一个结果。
More generally, the right side can be any kind of sequence (string, list or tuple). For example, to split an email address into a user name and a domain, you could write.
更普适的情况下，等号右边以是任意一种序列(字符串、列表或者元组)。比如，要把一个电子邮件地址转换成一个用户名和一个域名，可以用如下代码实现。
If you forget your User Name or password, Please click here to retrieve password, the password will be sent to your Email address.
如果您忘记密码或用户名，请点击'找回密码'并输入用户名，我们的系统将自动发送密码到您的有效邮箱中。
You don't have to give them an email address or anything-just create a user name and password and you're ready to go.
你无需提供电邮地址或别的什么——只需要创建一个用户名，和密码就可以了。
You don't have to give them an email address or anything-just create a user name and password and you're ready to go.
你无需提供电邮地址或别的什么——只需要创建一个用户名，和密码就可以了。
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