v1.1.4.rst

What's new in 1.1.4 (October 30, 2020)

These are the changes in pandas 1.1.4. See :ref:`release` for a full changelog including other versions of pandas.

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Fixed regressions

• Fixed regression in :func:`read_csv` raising a ValueError when names was of type dict_keys (:issue:`36928`)
• Fixed regression in :func:`read_csv` with more than 1M rows and specifying a index_col argument (:issue:`37094`)
• Fixed regression where attempting to mutate a :class:`DateOffset` object would no longer raise an AttributeError (:issue:`36940`)
• Fixed regression where :meth:`DataFrame.agg` would fail with :exc:`TypeError` when passed positional arguments to be passed on to the aggregation function (:issue:`36948`).
• Fixed regression in :class:`RollingGroupby` with sort=False not being respected (:issue:`36889`)
• Fixed regression in :meth:`Series.astype` converting None to "nan" when casting to string (:issue:`36904`)
• Fixed regression in :meth:`Series.rank` method failing for read-only data (:issue:`37290`)
• Fixed regression in :class:`RollingGroupby` causing a segmentation fault with Index of dtype object (:issue:`36727`)
• Fixed regression in :meth:`DataFrame.resample(...).apply(...)` raised AttributeError when input was a :class:`DataFrame` and only a :class:`Series` was evaluated (:issue:`36951`)
• Fixed regression in DataFrame.groupby(..).std() with nullable integer dtype (:issue:`37415`)
• Fixed regression in :class:`PeriodDtype` comparing both equal and unequal to its string representation (:issue:`37265`)
• Fixed regression where slicing :class:`DatetimeIndex` raised :exc:`AssertionError` on irregular time series with pd.NaT or on unsorted indices (:issue:`36953` and :issue:`35509`)
• Fixed regression in certain offsets (:meth:`pd.offsets.Day() <pandas.tseries.offsets.Day>` and below) no longer being hashable (:issue:`37267`)
• Fixed regression in :class:`StataReader` which required chunksize to be manually set when using an iterator to read a dataset (:issue:`37280`)
• Fixed regression in setitem with :meth:`DataFrame.iloc` which raised error when trying to set a value while filtering with a boolean list (:issue:`36741`)
• Fixed regression in setitem with a Series getting aligned before setting the values (:issue:`37427`)
• Fixed regression in :attr:`MultiIndex.is_monotonic_increasing` returning wrong results with NaN in at least one of the levels (:issue:`37220`)
• Fixed regression in inplace arithmetic operation on a Series not updating the parent DataFrame (:issue:`36373`)

Bug fixes

• Bug causing groupby(...).sum() and similar to not preserve metadata (:issue:`29442`)
• Bug in :meth:`Series.isin` and :meth:`DataFrame.isin` raising a ValueError when the target was read-only (:issue:`37174`)
• Bug in :meth:`.DataFrameGroupBy.fillna` and :meth:`.SeriesGroupBy.fillna` that introduced a performance regression after 1.0.5 (:issue:`36757`)
• Bug in :meth:`DataFrame.info` was raising a KeyError when the DataFrame has integer column names (:issue:`37245`)
• Bug in :meth:`DataFrameGroupby.apply` would drop a :class:`CategoricalIndex` when grouped on (:issue:`35792`)

Contributors

.. contributors:: v1.1.3..v1.1.4