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Version 0.19.1 (November 3, 2016)

{{ header }}

.. ipython:: python
   :suppress:

   from pandas import *  # noqa F401, F403

This is a minor bug-fix release from 0.19.0 and includes some small regression fixes, bug fixes and performance improvements. We recommend that all users upgrade to this version.

What's new in v0.19.1

Performance improvements

  • Fixed performance regression in factorization of Period data (:issue:`14338`)
  • Fixed performance regression in Series.asof(where) when where is a scalar (:issue:`14461`)
  • Improved performance in DataFrame.asof(where) when where is a scalar (:issue:`14461`)
  • Improved performance in .to_json() when lines=True (:issue:`14408`)
  • Improved performance in certain types of loc indexing with a MultiIndex (:issue:`14551`).

Bug fixes

  • Source installs from PyPI will now again work without cython installed, as in previous versions (:issue:`14204`)
  • Compat with Cython 0.25 for building (:issue:`14496`)
  • Fixed regression where user-provided file handles were closed in read_csv (c engine) (:issue:`14418`).
  • Fixed regression in DataFrame.quantile when missing values where present in some columns (:issue:`14357`).
  • Fixed regression in Index.difference where the freq of a DatetimeIndex was incorrectly set (:issue:`14323`)
  • Added back pandas.core.common.array_equivalent with a deprecation warning (:issue:`14555`).
  • Bug in pd.read_csv for the C engine in which quotation marks were improperly parsed in skipped rows (:issue:`14459`)
  • Bug in pd.read_csv for Python 2.x in which Unicode quote characters were no longer being respected (:issue:`14477`)
  • Fixed regression in Index.append when categorical indices were appended (:issue:`14545`).
  • Fixed regression in pd.DataFrame where constructor fails when given dict with None value (:issue:`14381`)
  • Fixed regression in DatetimeIndex._maybe_cast_slice_bound when index is empty (:issue:`14354`).
  • Bug in localizing an ambiguous timezone when a boolean is passed (:issue:`14402`)
  • Bug in TimedeltaIndex addition with a Datetime-like object where addition overflow in the negative direction was not being caught (:issue:`14068`, :issue:`14453`)
  • Bug in string indexing against data with object Index may raise AttributeError (:issue:`14424`)
  • Correctly raise ValueError on empty input to pd.eval() and df.query() (:issue:`13139`)
  • Bug in RangeIndex.intersection when result is a empty set (:issue:`14364`).
  • Bug in groupby-transform broadcasting that could cause incorrect dtype coercion (:issue:`14457`)
  • Bug in Series.__setitem__ which allowed mutating read-only arrays (:issue:`14359`).
  • Bug in DataFrame.insert where multiple calls with duplicate columns can fail (:issue:`14291`)
  • pd.merge() will raise ValueError with non-boolean parameters in passed boolean type arguments (:issue:`14434`)
  • Bug in Timestamp where dates very near the minimum (1677-09) could underflow on creation (:issue:`14415`)
  • Bug in pd.concat where names of the keys were not propagated to the resulting MultiIndex (:issue:`14252`)
  • Bug in pd.concat where axis cannot take string parameters 'rows' or 'columns' (:issue:`14369`)
  • Bug in pd.concat with dataframes heterogeneous in length and tuple keys (:issue:`14438`)
  • Bug in MultiIndex.set_levels where illegal level values were still set after raising an error (:issue:`13754`)
  • Bug in DataFrame.to_json where lines=True and a value contained a } character (:issue:`14391`)
  • Bug in df.groupby causing an AttributeError when grouping a single index frame by a column and the index level (:issue:`14327`)
  • Bug in df.groupby where TypeError raised when pd.Grouper(key=...) is passed in a list (:issue:`14334`)
  • Bug in pd.pivot_table may raise TypeError or ValueError when index or columns is not scalar and values is not specified (:issue:`14380`)

Contributors

.. contributors:: v0.19.0..v0.19.1