key() returns a dict_key object in python 3 which doesn't have index() so switch to use list() instead, which extracts the list of keys in both python 2 and 3.
key() returns a dict_key object in python 3 which doesn't have index() so switch to use list() instead, which extracts the list of keys in both python 2 and 3.

PiperOrigin-RevId: 239430447

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