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Python 3.10 is now generally available.

google.appengine.datastore.datastore_index.IndexToKey

Converts Index to key.

google.appengine.datastore.datastore_index.IndexToKey(
    index
)

index A datastore_index.Index instance (not None).

A tuple of the form (kind, ancestor, properties) where properties is a sequence of PropertySpec objects derived from the Index.