pandas.api.extensions.ExtensionArray.factorize — pandas 0.24.2 documentation (original) (raw)
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 labels array to indicate missing values. |
|---|---|
| Returns: | labels : 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. |
Notes
pandas.factorize() offers a sort keyword as well.