Why do I get AttributeError: 'NoneType' object has no attribute 'something'?

Question

I keep getting an error that says

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

The code I have is too long to post here. What general scenarios would cause this AttributeError, what is NoneType supposed to mean and how can I narrow down what's going on?

Answer 1

You are getting AttributeError: 'NoneType' object has no attribute 'something' because NoneType means that instead of an instance of whatever Class or Object you think you're working with, you've actually got None. It means that an assignment or function call up above failed or returned an unexpected result.

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Answer 2

I too was having issues with getting AttributeError: `NoneType` and later on I looked it up and found out what it was. So basically this error occurs when you try to call a method or access an attribute of a variable that is None.

Here are some common causes and how to fix the problem:

def my_function():

   print("Doing something")

result = my_function()  # result is None

result.some_method()  # This will raise an AttributeError

Uninitialized variables: A variable that has not been assigned a value is also None.

my_variable = None

my_variable.some_method()  # Raises AttributeError

Logic errors: A condition may not properly assign a variable, leaving it as None.

How to diagnose

Check function return values: Examine your functions to make sure they always return valid values.

Use print statements: Add a print statement before the error line to see what your variables contain.

Debugging tools: Use a debugger to step through your code and see your variable values ​​as it runs.

Check your conditional logic: Make sure all paths through your code properly initialize your variables.