These are the changes in pandas 1.6.0. See :ref:`release` for a full changelog including other versions of pandas.
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- :meth:`Series.add_suffix`, :meth:`DataFrame.add_suffix`, :meth:`Series.add_prefix` and :meth:`DataFrame.add_prefix` support an
axisargument. Ifaxisis set, the default behaviour of which axis to consider can be overwritten (:issue:`47819`)
These are bug fixes that might have notable behavior changes.
Some minimum supported versions of dependencies were updated. If installed, we now require:
| Package | Minimum Version | Required | Changed |
|---|---|---|---|
| X | X |
For optional libraries the general recommendation is to use the latest version. The following table lists the lowest version per library that is currently being tested throughout the development of pandas. Optional libraries below the lowest tested version may still work, but are not considered supported.
| Package | Minimum Version | Changed |
|---|---|---|
| X |
See :ref:`install.dependencies` and :ref:`install.optional_dependencies` for more.
- Performance improvement in :meth:`.GroupBy.cumprod` for extension array dtypes (:issue:`37493`)
- Performance improvement in :meth:`.GroupBy.mean` and :meth:`.GroupBy.var` for extension array dtypes (:issue:`37493`)
- Performance improvement for :meth:`MultiIndex.unique` (:issue:`48335`)
- Bug in :meth:`DataFrame.reindex` filling with wrong values when indexing columns and index for
uintdtypes (:issue:`48184`) - Bug in :meth:`DataFrame.reindex` casting dtype to
objectwhen :class:`DataFrame` has single extension array column when re-indexingcolumnsandindex(:issue:`48190`)
- Bug in :meth:`MultiIndex.unique` losing extension array dtype (:issue:`48335`)
- Bug in :meth:`MultiIndex.append` not checking names for equality (:issue:`48288`)