pandas.api.extensions.ExtensionArray.factorize

ExtensionArray.factorize(self, na_sentinel: int = -1) → Tuple[numpy.ndarray, pandas.core.dtypes.generic.ABCExtensionArray]

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.

See also

factorize

Top-level factorize method that dispatches here.

Notes

pandas.factorize() offers a sort keyword as well.

pandas.api.extensions.ExtensionArray.dropna pandas.api.extensions.ExtensionArray.fillna