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- Bug in :class:`Index` where a numpy object array with a timezone aware :class:`Timestamp` and
np.nanwould not return a :class:`DatetimeIndex` (:issue:`27011`)
- Bug in :meth:`Series.interpolate` when using a timezone aware :class:`DatetimeIndex` (:issue:`27548`)
- Bug when printing negative floating point complex numbers would raise an
IndexError(:issue:`27484`)
- Added a pandas_plotting_backends entrypoint group for registering plot backends. See :ref:`extending.plotting-backends` for more (:issue:`26747`).
- Bug in :meth:`pandas.core.groupby.DataFrameGroupBy.transform` where applying a timezone conversion lambda function would drop timezone information (:issue:`27496`)
- A
KeyErroris now raised if.unstack()is called on a :class:`Series` or :class:`DataFrame` with a flat :class:`Index` passing a name which is not the correct one (:issue:`18303`)
.. contributors:: HEAD..HEAD