These are the changes in pandas 1.2.0. See :ref:`release` for a full changelog including other versions of pandas.
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- Performance improvement in :meth:`DataFrame.groupby` when aggregating categorical data (:issue:`32976`)
- Bug in :func:`date_range` was raising AmbiguousTimeError for valid input with ambiguous=False (:issue:`35297`)
- :meth:`DataFrame.groupby` aggregations of categorical series will now return a :class:`Categorical` while preserving the codes and categories of the original series (:issue:`33739`)