What's new in 1.0.0 (??)

Warning

Starting with the 0.25.x series of releases, pandas only supports Python 3.5.3 and higher. See Dropping Python 2.7 for more details.

Warning

The minimum supported Python version will be bumped to 3.6 in a future release.

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These are the changes in pandas 1.0.0. See :ref:`release` for a full changelog including other versions of pandas.

Enhancements

Other enhancements

Backwards incompatible API changes

:class:`pandas.core.groupby.GroupBy.transform` now raises on invalid operation names (:issue:`27489`).

Other API changes

:meth:`pandas.api.types.infer_dtype` will now return "integer-na" for integer and np.nan mix (:issue:`27283`)

Deprecations

Removal of prior version deprecations/changes

Removed the previously deprecated :meth:`Series.get_value`, :meth:`Series.set_value`, :meth:`DataFrame.get_value`, :meth:`DataFrame.set_value` (:issue:`17739`)
Changed the the default value of inplace in :meth:`DataFrame.set_index` and :meth:`Series.set_axis`. It now defaults to False (:issue:`27600`)
:meth:`pandas.Series.str.cat` now defaults to aligning others, using join='left' (:issue:`27611`)
:meth:`pandas.Series.str.cat` does not accept list-likes within list-likes anymore (:issue:`27611`)
Removed the previously deprecated :meth:`ExtensionArray._formatting_values`. Use :attr:`ExtensionArray._formatter` instead. (:issue:`23601`)

Performance improvements

Performance improvement in indexing with a non-unique :class:`IntervalIndex` (:issue:`27489`)
Performance improvement in MultiIndex.is_monotonic (:issue:`27495`)
Performance improvement in :func:`cut` when bins is an :class:`IntervalIndex` (:issue:`27668`)

Bug fixes

Categorical

Datetimelike

Bug in :meth:`Series.__setitem__` incorrectly casting np.timedelta64("NaT") to np.datetime64("NaT") when inserting into a :class:`Series` with datetime64 dtype (:issue:`27311`)
Bug in :meth:`Series.dt` property lookups when the underlying data is read-only (:issue:`27529`)

Timedelta

Timezones

Numeric

Bug in :meth:`DataFrame.quantile` with zero-column :class:`DataFrame` incorrectly raising (:issue:`23925`)

Conversion

Strings

Interval

Indexing

Missing

MultiIndex

I/O

Plotting

Groupby/resample/rolling

Bug in :meth:`DataFrame.groupby` not offering selection by column name when axis=1 (:issue:`27614`)

Reshaping

Sparse

Build Changes

ExtensionArray

Other

Trying to set the display.precision, display.max_rows or display.max_columns using :meth:`set_option` to anything but a None or a positive int will raise a ValueError (:issue:`23348`)

Contributors