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:`DataFrameGroupBy.apply` that would some times throw an erroneous
ValueError
if the grouping axis had duplicate entries (:issue:`16646`)