What’s new in 2.1.4 (December 8, 2023) — pandas 2.2.3 documentation (original) (raw)

These are the changes in pandas 2.1.4. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

• Fixed regression when trying to read a pickled pandas DataFrame from pandas 1.3 (GH 55137)

Bug fixes#

• Bug in Series constructor raising DeprecationWarning when index is a list of Series (GH 55228)
• Bug in Series when trying to cast date-like string inputs to ArrowDtype of pyarrow.timestamp (GH 56266)
• Bug in Timestamp construction with ts_input="now" or ts_input="today" giving a different unit from Timestamp.now() or Timestamp.today() (GH 55879)
• Bug in Index.__getitem__() returning wrong result for Arrow dtypes and negative stepsize (GH 55832)
• Fixed bug in read_csv() not respecting object dtype when infer_string option is set (GH 56047)
• Fixed bug in to_numeric() converting to extension dtype for string[pyarrow_numpy] dtype (GH 56179)
• Fixed bug in DataFrameGroupBy.min() and DataFrameGroupBy.max() not preserving extension dtype for empty object (GH 55619)
• Fixed bug in DataFrame.__setitem__() casting Index with object-dtype to PyArrow backed strings when infer_string option is set (GH 55638)
• Fixed bug in DataFrame.to_hdf() raising when columns have StringDtype (GH 55088)
• Fixed bug in Index.insert() casting object-dtype to PyArrow backed strings when infer_string option is set (GH 55638)
• Fixed bug in Series.__ne__() resulting in False for comparison between NA and string value for dtype="string[pyarrow_numpy]" (GH 56122)
• Fixed bug in Series.mode() not keeping object dtype when infer_string is set (GH 56183)
• Fixed bug in Series.reset_index() not preserving object dtype when infer_string is set (GH 56160)
• Fixed bug in Series.str.split() and Series.str.rsplit() when pat=None for ArrowDtype with pyarrow.string (GH 56271)
• Fixed bug in Series.str.translate() losing object dtype when string option is set (GH 56152)

Contributors#

A total of 12 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Daniel Isaac
• Joris Van den Bossche
• Luke Manley
• Lumberbot (aka Jack)
• Marco Edward Gorelli
• Matthew Roeschke
• Pandas Development Team
• Patrick Hoefler
• Thomas Li
• William Ayd
• Yao Xiao
• pre-commit-ci[bot]