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/pandas 0.23

pandas.Series.dt.day_name

Series.dt.day_name(*args, **kwargs) [source]

Return the day names of the DateTimeIndex with specified locale.

Parameters:

locale : string, default None (English locale)

locale determining the language in which to return the day name

Returns:

month_names : Index

Index of day names

.. versionadded:: 0.23.0

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http://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.Series.dt.day_name.html