API: Add str/dt accessors to categorical · Issue #10661 · pandas-dev/pandas (original) (raw)

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Description

Accessors should be enabled depending on categories. Should care CategoricalIndex also.

import pandas as pd
s = pd.Series(['A', 'B'], dtype='category')
s.str
# AttributeError: Can only use .str accessor with string values, which use np.object_ dtype in pandas

s = pd.Series([pd.Timestamp('2011-01-01'), pd.Timestamp('2011-01-01')], dtype='category')
s.dt
# AttributeError: Can only use .dt accessor with datetimelike values