What’s new in 1.3.5 (December 12, 2021)#

These are the changes in pandas 1.3.5. See Release notes for a full changelog including other versions of pandas.

Fixed regressions#

Fixed regression in Series.equals() when comparing floats with dtype object to None (GH 44190)
Fixed regression in merge_asof() raising error when array was supplied as join key (GH 42844)
Fixed regression when resampling DataFrame with DateTimeIndex with empty groups and uint8, uint16 or uint32 columns incorrectly raising RuntimeError (GH 43329)
Fixed regression in creating a DataFrame from a timezone-aware Timestamp scalar near a Daylight Savings Time transition (GH 42505)
Fixed performance regression in read_csv() (GH 44106)
Fixed regression in Series.duplicated() and Series.drop_duplicates() when Series has Categorical dtype with boolean categories (GH 44351)
Fixed regression in DataFrameGroupBy.sum() and SeriesGroupBy.sum() with timedelta64[ns] dtype containing NaT failing to treat that value as NA (GH 42659)
Fixed regression in RollingGroupby.cov() and RollingGroupby.corr() when other had the same shape as each group would incorrectly return superfluous groups in the result (GH 42915)

A total of 10 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.