TypeError: ‘dict_keys’ object does not support indexing

Clearly you’re passing in d.keys() to your shuffle function. Probably this was written with python2.x (when d.keys() returned a list). With python3.x, d.keys() returns a dict_keys object which behaves a lot more like a set than a list. As such, it can’t be indexed.

The solution is to pass list(d.keys()) (or simply list(d)) to shuffle.

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