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Merge pull request #10965 from Winterflower/pandas-doc-10700
DOC: Add note regarding 0-len string to default NA values in IO docs
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doc/source/io.rst

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@@ -731,7 +731,9 @@ the corresponding equivalent values will also imply a missing value (in this cas
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To completely override the default values that are recognized as missing, specify ``keep_default_na=False``.
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The default ``NaN`` recognized values are ``['-1.#IND', '1.#QNAN', '1.#IND', '-1.#QNAN', '#N/A','N/A', 'NA',
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'#NA', 'NULL', 'NaN', '-NaN', 'nan', '-nan']``.
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'#NA', 'NULL', 'NaN', '-NaN', 'nan', '-nan']``. Although a 0-length string
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``''`` is not included in the default ``NaN`` values list, it is still treated
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as a missing value.
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.. code-block:: python
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