BUG/TST: typo caused read_csv to lose index name #1536

Author: Chang She

pandas/io/parsers.py

@@ -662,7 +662,7 @@ def _get_index_name(self, columns=None):
             index_name = None
         elif np.isscalar(self.index_col):
             if isinstance(self.index_col, basestring):
-                index_names = self.index_col
+                index_name = self.index_col
                 for i, c in enumerate(list(columns)):
                     if c == self.index_col:
                         self.index_col = i

pandas/io/tests/test_parsers.py

@@ -334,6 +334,23 @@ def test_index_col_named(self):
         self.assertRaises(ValueError, read_csv, StringIO(no_header),
                           index_col='ID')
 
+        data = """\
+1,2,3,4,hello
+5,6,7,8,world
+9,10,11,12,foo
+"""
+        names = ['a', 'b', 'c', 'd', 'message']
+        xp = DataFrame({'a' : [1, 5, 9], 'b' : [2, 6, 10], 'c' : [3, 7, 11],
+                        'd' : [4, 8, 12]},
+                       index=Index(['hello', 'world', 'foo'], name='message'))
+        rs = read_csv(StringIO(data), names=names, index_col=['message'])
+        assert_frame_equal(xp, rs)
+        self.assert_(xp.index.name == rs.index.name)
+
+        rs = read_csv(StringIO(data), names=names, index_col='message')
+        assert_frame_equal(xp, rs)
+        self.assert_(xp.index.name == rs.index.name)
+
     def test_multiple_skts_example(self):
         data = "year, month, a, b\n 2001, 01, 0.0, 10.\n 2001, 02, 1.1, 11."
         pass