pandas.api.extensions.ExtensionArray.factorize#

ExtensionArray.factorize(na_sentinel=_NoDefault.no_default, use_na_sentinel=_NoDefault.no_default)[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.

Deprecated since version 1.5.0: The na_sentinel argument is deprecated and will be removed in a future version of pandas. Specify use_na_sentinel as either True or False.
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.