python - 为什么会出现AttributeError：'NoneType'对象没有属性'something'？(Why do I get AttributeError: 'NoneType' object has no attribute 'something'?)

Question

I keep getting an error that says

(我不断收到错误消息，说)

AttributeError: 'NoneType' object has no attribute 'something'

The code I have is too long to post here.

(我的代码太长了，无法在此处发布。)

What general scenarios would cause this AttributeError , what is NoneType supposed to mean and how can I narrow down what's going on?

(什么一般情况会导致此AttributeError ， NoneType应该是什么意思，以及如何缩小正在发生的情况？)

  ask by Jacob Griffin translate from so

Answer 1

NoneType means that instead of an instance of whatever Class or Object you think you're working with, you've actually got None .

(NoneType意味着实际上没有None ，而不是您认为正在使用的任何Class或Object的实例。)

That usually means that an assignment or function call up above failed or returned an unexpected result.

(这通常意味着在上面的赋值或函数调用失败或返回了意外结果。)