'ContactForm' object has no attribute 'cleaned

在学习The django book 的时候，出现了下面的错误
'ContactForm' object has no attribute 'cleaned_data'

但是实际上这个方法是存在的，后来检查代码发现下面标红的括号给遗漏掉了，就出现这个问题，后来加上就好了，
if form.is_valid[color=red]()[/color]:
cd = form.cleaned_data

疑问点在于：难道每次调用cleaned_data都得先调用is_valid()方法吗？

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'ContactForm' object has no attribute 'cleaned_data'

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