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DOC: Better explain the behaviour of na_values #10488

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Jul 2, 2015
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DOC: Better explain the behaviour of na_values #10488

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5 changes: 3 additions & 2 deletions doc/source/io.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,7 @@ They can take a number of arguments:
as the index.
- ``names``: List of column names to use as column names. To replace header
existing in file, explicitly pass ``header=0``.
- ``na_values``: optional list of strings to recognize as NaN (missing
- ``na_values``: optional string or list of strings to recognize as NaN (missing
values), either in addition to or in lieu of the default set.
- ``true_values``: list of strings to recognize as ``True``
- ``false_values``: list of strings to recognize as ``False``
Expand Down Expand Up @@ -723,7 +723,8 @@ NA Values
~~~~~~~~~

To control which values are parsed as missing values (which are signified by ``NaN``), specifiy a
list of strings in ``na_values``. If you specify a number (a ``float``, like ``5.0`` or an ``integer`` like ``5``),
string in ``na_values``. If you specify a list of strings, then all values in
it are considered to be missing values. If you specify a number (a ``float``, like ``5.0`` or an ``integer`` like ``5``),
the corresponding equivalent values will also imply a missing value (in this case effectively
``[5.0,5]`` are recognized as ``NaN``.

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