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Make -NaN and -nan default NA values #6038

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Jan 23, 2014
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Make -NaN and -nan default NA values #6038

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2 changes: 1 addition & 1 deletion doc/source/io.rst
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Expand Up @@ -575,7 +575,7 @@ the corresponding equivalent values will also imply a missing value (in this cas

To completely override the default values that are recognized as missing, specify ``keep_default_na=False``.
The default ``NaN`` recognized values are ``['-1.#IND', '1.#QNAN', '1.#IND', '-1.#QNAN', '#N/A','N/A', 'NA',
'#NA', 'NULL', 'NaN', 'nan']``.
'#NA', 'NULL', 'NaN', '-NaN', 'nan', '-nan']``.

.. code-block:: python

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2 changes: 2 additions & 0 deletions doc/source/release.rst
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Expand Up @@ -64,6 +64,8 @@ API Changes
- ``autocorrelation_plot`` now accepts ``**kwargs``. (:issue:`5623`)
- ``convert_objects`` now accepts a ``convert_timedeltas='coerce'`` argument to allow forced dtype conversion of
timedeltas (:issue:`5458`,:issue:`5689`)
- Add ``-NaN`` and ``-nan`` to the default set of NA values
(:issue:`5952`). See :ref:`NA Values <io.na_values>`.

Experimental Features
~~~~~~~~~~~~~~~~~~~~~
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3 changes: 3 additions & 0 deletions doc/source/v0.13.1.txt
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Expand Up @@ -18,6 +18,9 @@ There are several new or updated docs sections including:
API changes
~~~~~~~~~~~

- Add ``-NaN`` and ``-nan`` to the default set of NA values (:issue:`5952`).
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just add this line also to doc/source/release.rst under API changes as well. we use the whatsnew to 'announce' important changes, and the release.rst as a log of them

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Should be there now.

See :ref:`NA Values <io.na_values>`.

Prior Version Deprecations/Changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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2 changes: 1 addition & 1 deletion pandas/io/parsers.py
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Expand Up @@ -449,7 +449,7 @@ def read_fwf(filepath_or_buffer, colspecs='infer', widths=None, **kwds):
# '1.#INF','-1.#INF', '1.#INF000000',
_NA_VALUES = set([
'-1.#IND', '1.#QNAN', '1.#IND', '-1.#QNAN', '#N/A', 'N/A', 'NA', '#NA',
'NULL', 'NaN', 'nan', ''
'NULL', 'NaN', '-NaN', 'nan', '-nan', ''
])


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5 changes: 3 additions & 2 deletions pandas/io/tests/test_parsers.py
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Expand Up @@ -33,6 +33,7 @@
import pandas.tseries.tools as tools

from numpy.testing.decorators import slow
from numpy.testing import assert_array_equal

from pandas.parser import OverflowError

Expand Down Expand Up @@ -685,8 +686,8 @@ def test_non_string_na_values(self):
def test_default_na_values(self):
_NA_VALUES = set(['-1.#IND', '1.#QNAN', '1.#IND', '-1.#QNAN',
'#N/A','N/A', 'NA', '#NA', 'NULL', 'NaN',
'nan', ''])

'nan', '-NaN', '-nan', ''])
assert_array_equal (_NA_VALUES, parsers._NA_VALUES)
nv = len(_NA_VALUES)
def f(i, v):
if i == 0:
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