Merge pull request #7639 from jreback/na_values

REGR: Add back #N/A N/A as a default NA value (regresion from 0.12) (GH5521)

Author: jreback

doc/source/v0.14.1.txt

@@ -59,6 +59,7 @@ API changes
   object isn't a ``Period`` ``False`` is returned. (:issue:`7376`)
 
 - Bug in ``.loc`` performing fallback integer indexing with ``object`` dtype indices (:issue:`7496`)
+- Add back ``#N/A N/A`` as a default NA value in text parsing, (regresion from 0.12) (:issue:`5521`)
 
 .. _whatsnew_0141.prior_deprecations:
 

pandas/io/parsers.py

@@ -487,7 +487,7 @@ def read_fwf(filepath_or_buffer, colspecs='infer', widths=None, **kwds):
 # no longer excluding inf representations
 # '1.#INF','-1.#INF', '1.#INF000000',
 _NA_VALUES = set([
-    '-1.#IND', '1.#QNAN', '1.#IND', '-1.#QNAN', '#N/A', 'N/A', 'NA', '#NA',
+    '-1.#IND', '1.#QNAN', '1.#IND', '-1.#QNAN', '#N/A N/A', '#N/A', 'N/A', 'NA', '#NA',
     'NULL', 'NaN', '-NaN', 'nan', '-nan', ''
 ])
 

pandas/io/tests/test_parsers.py

@@ -706,7 +706,7 @@ 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', '-NaN', '-nan', '#N/A N/A',''])
         assert_array_equal (_NA_VALUES, parsers._NA_VALUES)
         nv = len(_NA_VALUES)
         def f(i, v):