pandas.api.extensions.ExtensionArray.factorize#

ExtensionArray.factorize(use_na_sentinel=True)[source]#

Encode the extension array as an enumerated type.

Parameters

use_na_sentinelbool, default True: If True, the sentinel -1 will be used for NaN values. If False, NaN values will be encoded as non-negative integers and will not drop the NaN from the uniques of the values.

New in version 1.5.0.

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.