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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- Bug in :func:`date_range` was raising AmbiguousTimeError for valid input with ambiguous=False (:issue:`35297`)
- Bug in :meth:`DataFrame.groupby` does not always maintain column index name for
any,all,bfill,ffill,shift(:issue:`29764`)