_values_for_factorize(self) -> 'tuple[np.ndarray, Any]'
The values returned by this method are also used in pandas.util.hash_pandas_object
.
An array suitable for factorization. This should maintain order and be a supported dtype (Float64, Int64, UInt64, String, Object). By default, the extension array is cast to object dtype.
The value in :None:None:`values` to consider missing. This will be treated as NA in the factorization routines, so it will be coded as :None:None:`na_sentinel` and not included in uniques
. By default, np.nan
is used.
Return an array and missing value suitable for factorization.
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