These are the changes in pandas 1.2.1. See :ref:`release` for a full changelog including other versions of pandas.
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The check_freq argument was added to :func:`testing.assert_frame_equal` in pandas 1.1.0 and defaults to True. :func:`testing.assert_frame_equal` now raises AssertionError if the indexes do not have the same frequency. Before pandas 1.1.0, the index frequency was not checked by :func:`testing.assert_frame_equal`.
- The deprecated attributes
_AXIS_NAMESand_AXIS_NUMBERSof :class:`DataFrame` and :class:`Series` will no longer show up indirorinspect.getmemberscalls (:issue:`38740`) - Fixed regression in :meth:`to_csv` that created corrupted zip files when there were more rows than
chunksize(:issue:`38714`) - Fixed a regression in
groupby().rolling()where :class:`MultiIndex` levels were dropped (:issue:`38523`) - Fixed regression in repr of float-like strings of an
objectdtype having trailing 0's truncated after the decimal (:issue:`38708`) - Fixed regression in :meth:`DataFrame.groupby()` with :class:`Categorical` grouping column not showing unused categories for
grouped.indices(:issue:`38642`) - Fixed regression in :meth:`DataFrame.any` and :meth:`DataFrame.all` not returning a result for tz-aware
datetime64columns (:issue:`38723`) - Fixed regression in :meth:`.GroupBy.sem` where the presence of non-numeric columns would cause an error instead of being dropped (:issue:`38774`)
- Fixed regression in :func:`read_excel` with non-rawbyte file handles (:issue:`38788`)
- Bug in :meth:`read_csv` with
float_precision="high"caused segfault or wrong parsing of long exponent strings. This resulted in a regression in some cases as the default forfloat_precisionwas changed in pandas 1.2.0 (:issue:`38753`) - Fixed regression in :meth:`Rolling.skew` and :meth:`Rolling.kurt` modifying the object inplace (:issue:`38908`)
- Bumped minimum fastparquet version to 0.4.0 to avoid
AttributeErrorfrom numba (:issue:`38344`) - Bumped minimum pymysql version to 0.8.1 to avoid test failures (:issue:`38344`)
- Fixed build failure on MacOS 11 in Python 3.9.1 (:issue:`38766`)
.. contributors:: v1.2.0..v1.2.1|HEAD