What’s new in 1.3.1 (July 25, 2021) — pandas 2.2.3 documentation (original) (raw)

These are the changes in pandas 1.3.1. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

• Pandas could not be built on PyPy (GH 42355)
• DataFrame constructed with an older version of pandas could not be unpickled (GH 42345)
• Performance regression in constructing a DataFrame from a dictionary of dictionaries (GH 42248)
• Fixed regression in DataFrame.agg() dropping values when the DataFrame had an Extension Array dtype, a duplicate index, and axis=1 (GH 42380)
• Fixed regression in DataFrame.astype() changing the order of noncontiguous data (GH 42396)
• Performance regression in DataFrame in reduction operations requiring casting such as DataFrame.mean() on integer data (GH 38592)
• Performance regression in DataFrame.to_dict() and Series.to_dict() when orient argument one of “records”, “dict”, or “split” (GH 42352)
• Fixed regression in indexing with a list subclass incorrectly raising TypeError (GH 42433, GH 42461)
• Fixed regression in DataFrame.isin() and Series.isin() raising TypeError with nullable data containing at least one missing value (GH 42405)
• Regression in concat() between objects with bool dtype and integer dtype casting to object instead of to integer (GH 42092)
• Bug in Series constructor not accepting a dask.Array (GH 38645)
• Fixed regression for SettingWithCopyWarning displaying incorrect stacklevel (GH 42570)
• Fixed regression for merge_asof() raising KeyError when one of the by columns is in the index (GH 34488)
• Fixed regression in to_datetime() returning pd.NaT for inputs that produce duplicated values, when cache=True (GH 42259)
• Fixed regression in SeriesGroupBy.value_counts() that resulted in an IndexError when called on a Series with one row (GH 42618)

Bug fixes#

• Fixed bug in DataFrame.transpose() dropping values when the DataFrame had an Extension Array dtype and a duplicate index (GH 42380)
• Fixed bug in DataFrame.to_xml() raising KeyError when called with index=False and an offset index (GH 42458)
• Fixed bug in Styler.set_sticky() not handling index names correctly for single index columns case (GH 42537)
• Fixed bug in DataFrame.copy() failing to consolidate blocks in the result (GH 42579)

Contributors#

A total of 17 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Fangchen Li
• GYvan +
• Matthew Roeschke
• Matthew Zeitlin
• MeeseeksMachine
• Pandas Development Team
• Patrick Hoefler
• Richard Shadrach
• Shoham Debnath +
• Simon Hawkins
• Stephan Heßelmann +
• Stephen +
• Thomas Li
• Zheyuan +
• attack68
• jbrockmendel
• neelmraman +