pandas.api.extensions.ExtensionArray.factorize

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

Encode the extension array as an enumerated type.

Parameters

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

Returns

codes:ndarray: An integer NumPy array that’s an indexer into the original ExtensionArray.
uniques:ExtensionArray: 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.