factorize(self, na_sentinel: 'int' = -1) -> 'tuple[np.ndarray, ExtensionArray]'
pandas.factorize
offers a sort
keyword as well.
Value to use in the :None:None:`codes` array to indicate missing values.
An integer NumPy array that's an indexer into the original ExtensionArray.
An ExtensionArray containing the unique values of :None:None:`self`.
uniques will not contain an entry for the NA value of the ExtensionArray if there are any missing values present in :None:None:`self`.
Encode the extension array as an enumerated type.
factorize
Top-level factorize method that dispatches here.
The following pages refer to to this document either explicitly or contain code examples using this.
pandas.core.arrays.masked.BaseMaskedArray.factorize
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