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 (GH44190)

  • Fixed regression in merge_asof() raising error when array was supplied as join key (GH42844)

  • Fixed regression when resampling DataFrame with DateTimeIndex with empty groups and uint8, uint16 or uint32 columns incorrectly raising RuntimeError (GH43329)

  • Fixed regression in creating a DataFrame from a timezone-aware Timestamp scalar near a Daylight Savings Time transition (GH42505)

  • Fixed performance regression in read_csv() (GH44106)

  • Fixed regression in Series.duplicated() and Series.drop_duplicates() when Series has Categorical dtype with boolean categories (GH44351)

  • Fixed regression in GroupBy.sum() with timedelta64[ns] dtype containing NaT failing to treat that value as NA (GH42659)

  • 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 (GH42915)


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

  • Ali McMaster

  • Matthew Roeschke

  • Matthew Zeitlin

  • MeeseeksMachine

  • Pandas Development Team

  • Patrick Hoefler

  • Simon Hawkins

  • Thomas Li

  • Tobias Pitters

  • jbrockmendel