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""" Implementation of pandas.Series.str and its interface. * strings.accessor.StringMethods : Accessor for Series.str * strings.base.BaseStringArrayMethods: Mixin ABC for EAs to implement str methods Most methods on the StringMethods accessor follow the pattern: 1. extract the array from the series (or index) 2. Call that array's implementation of the string method 3. Wrap the result (in a Series, index, or DataFrame) Pandas extension arrays implementing string methods should inherit from pandas.core.strings.base.BaseStringArrayMethods. This is an ABC defining the various string methods. To avoid namespace clashes and pollution, these are prefixed with `_str_`. So ``Series.str.upper()`` calls ``Series.array._str_upper()``. The interface isn't currently public to other string extension arrays. """ # Pandas current implementation is in ObjectStringArrayMixin. This is designed # to work on object-dtype ndarrays. # # BaseStringArrayMethods # - ObjectStringArrayMixin # - StringArray # - NumpyExtensionArray # - Categorical # - ArrowStringArray
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