◆ErrorOracle
python

TypeError: 'NoneType' object is not subscriptable

Error message

TypeError: 'NoneType' object is not subscriptable

What broke

You attempted to subscript a variable that is currently set to None. This typically happens when a function that is expected to return a list or dictionary instead returns None.

Why it broke

The root cause is that the variable you are trying to access was not properly initialized or assigned a value. This can occur if a function fails to return the expected data or if a variable is not set correctly.

How to fix

To fix this, ensure that the variable is assigned a valid list or dictionary before attempting to subscript it. You can also add checks to confirm that the variable is not None before accessing it.

Code fix

if my_variable is not None: value = my_variable[index] else: value = default_value

Explained by ErrorOracle

Prevention tip

You can also add checks to confirm that the variable is not None before accessing it.

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