pandas.api.extensions.ExtensionArray.factorize#

ExtensionArray.factorize(na_sentinel=- 1)[source]#

Encode the extension array as an enumerated type.

Parameters

na_sentinelint, default -1: Value to use in the codes array to indicate missing values.

Returns

codesndarray: An integer NumPy array that’s an indexer into the original ExtensionArray.
uniquesExtensionArray: An ExtensionArray containing the unique values of self.

Note

uniques will not contain an entry for the NA value of the ExtensionArray if there are any missing values present in self.