Skip to content

Latest commit

 

History

History
98 lines (72 loc) · 5.47 KB

v0.19.2.rst

File metadata and controls

98 lines (72 loc) · 5.47 KB

Version 0.19.2 (December 24, 2016)

{{ header }}

.. ipython:: python
   :suppress:

   from pandas import *  # noqa F401, F403

This is a minor bug-fix release in the 0.19.x series and includes some small regression fixes, bug fixes and performance improvements. We recommend that all users upgrade to this version.

Highlights include:

What's new in v0.19.2

Enhancements

The pd.merge_asof(), added in 0.19.0, gained some improvements:

  • pd.merge_asof() gained left_index/right_index and left_by/right_by arguments (:issue:`14253`)
  • pd.merge_asof() can take multiple columns in by parameter and has specialized dtypes for better performance (:issue:`13936`)

Performance improvements

Bug fixes

  • Compat with python 3.6 for pickling of some offsets (:issue:`14685`)
  • Compat with python 3.6 for some indexing exception types (:issue:`14684`, :issue:`14689`)
  • Compat with python 3.6 for deprecation warnings in the test suite (:issue:`14681`)
  • Compat with python 3.6 for Timestamp pickles (:issue:`14689`)
  • Compat with dateutil==2.6.0; segfault reported in the testing suite (:issue:`14621`)
  • Allow nanoseconds in Timestamp.replace as a kwarg (:issue:`14621`)
  • Bug in pd.read_csv in which aliasing was being done for na_values when passed in as a dictionary (:issue:`14203`)
  • Bug in pd.read_csv in which column indices for a dict-like na_values were not being respected (:issue:`14203`)
  • Bug in pd.read_csv where reading files fails, if the number of headers is equal to the number of lines in the file (:issue:`14515`)
  • Bug in pd.read_csv for the Python engine in which an unhelpful error message was being raised when multi-char delimiters were not being respected with quotes (:issue:`14582`)
  • Fix bugs (:issue:`14734`, :issue:`13654`) in pd.read_sas and pandas.io.sas.sas7bdat.SAS7BDATReader that caused problems when reading a SAS file incrementally.
  • Bug in pd.read_csv for the Python engine in which an unhelpful error message was being raised when skipfooter was not being respected by Python's CSV library (:issue:`13879`)
  • Bug in .fillna() in which timezone aware datetime64 values were incorrectly rounded (:issue:`14872`)
  • Bug in .groupby(..., sort=True) of a non-lexsorted MultiIndex when grouping with multiple levels (:issue:`14776`)
  • Bug in pd.cut with negative values and a single bin (:issue:`14652`)
  • Bug in pd.to_numeric where a 0 was not unsigned on a downcast='unsigned' argument (:issue:`14401`)
  • Bug in plotting regular and irregular timeseries using shared axes (sharex=True or ax.twinx()) (:issue:`13341`, :issue:`14322`).
  • Bug in not propagating exceptions in parsing invalid datetimes, noted in python 3.6 (:issue:`14561`)
  • Bug in resampling a DatetimeIndex in local TZ, covering a DST change, which would raise AmbiguousTimeError (:issue:`14682`)
  • Bug in indexing that transformed RecursionError into KeyError or IndexingError (:issue:`14554`)
  • Bug in HDFStore when writing a MultiIndex when using data_columns=True (:issue:`14435`)
  • Bug in HDFStore.append() when writing a Series and passing a min_itemsize argument containing a value for the index (:issue:`11412`)
  • Bug when writing to a HDFStore in table format with a min_itemsize value for the index and without asking to append (:issue:`10381`)
  • Bug in Series.groupby.nunique() raising an IndexError for an empty Series (:issue:`12553`)
  • Bug in DataFrame.nlargest and DataFrame.nsmallest when the index had duplicate values (:issue:`13412`)
  • Bug in clipboard functions on linux with python2 with unicode and separators (:issue:`13747`)
  • Bug in clipboard functions on Windows 10 and python 3 (:issue:`14362`, :issue:`12807`)
  • Bug in .to_clipboard() and Excel compat (:issue:`12529`)
  • Bug in DataFrame.combine_first() for integer columns (:issue:`14687`).
  • Bug in pd.read_csv() in which the dtype parameter was not being respected for empty data (:issue:`14712`)
  • Bug in pd.read_csv() in which the nrows parameter was not being respected for large input when using the C engine for parsing (:issue:`7626`)
  • Bug in pd.merge_asof() could not handle timezone-aware DatetimeIndex when a tolerance was specified (:issue:`14844`)
  • Explicit check in to_stata and StataWriter for out-of-range values when writing doubles (:issue:`14618`)
  • Bug in .plot(kind='kde') which did not drop missing values to generate the KDE Plot, instead generating an empty plot. (:issue:`14821`)
  • Bug in unstack() if called with a list of column(s) as an argument, regardless of the dtypes of all columns, they get coerced to object (:issue:`11847`)

Contributors

.. contributors:: v0.19.1..v0.19.2