How to fix 'return self.attrs[key] KeyError: 0'
In lists, python offers a way to locate every item's position starting with [0]. So once this error is generated it means the 'list' you may be placing the key against isn''t;
1. A list in the first place
2. The position you may be referring to is misplaced, doesn't exist or not in the right range.
In such a case you may want to check first if what you are targeting in the first place is a list or not before trying to get the exact number of keys to that list. I hope this helps? Happy coding!
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