Python printed this

TypeError: 'NoneType' object is not subscriptable

What it meansYou tried to index or slice a value that is None, so the variable you expected to hold a list or dict actually holds nothing.

The first thing to checkUsually a function returned None implicitly or a lookup found nothing; check where the variable was assigned and guard for None before indexing it.

The walrus saysNone is not a dictionary, no matter how hard you subscript it.