Merge pull request #8812 from onesandzeroes/plotlabel

VIS: plot with `use_index=False` shouldn't plot the index name

Author: Tom Augspurger

doc/source/whatsnew/v0.15.2.txt

@@ -93,3 +93,4 @@ Bug Fixes
 
 - Bug in `pd.infer_freq`/`DataFrame.inferred_freq` that prevented proper sub-daily frequency inference
   when the index contained DST days (:issue:`8772`).
+- Bug where index name was still used when plotting a series with ``use_index=False`` (:issue:`8558`).

pandas/tests/test_graphics.py

@@ -569,6 +569,16 @@ def test_line_area_nan_series(self):
             ax = _check_plot_works(d.plot, kind='area', stacked=False)
             self.assert_numpy_array_equal(ax.lines[0].get_ydata(), expected)
 
+    def test_line_use_index_false(self):
+        s = Series([1, 2, 3], index=['a', 'b', 'c'])
+        s.index.name = 'The Index'
+        ax = s.plot(use_index=False)
+        label = ax.get_xlabel()
+        self.assertEqual(label, '')
+        ax2 = s.plot(kind='bar', use_index=False)
+        label2 = ax2.get_xlabel()
+        self.assertEqual(label2, '')
+
     @slow
     def test_bar_log(self):
         expected = np.array([1., 10., 100., 1000.])

pandas/tools/plotting.py

@@ -1685,7 +1685,7 @@ def _post_plot_logic(self):
                     self.rot = 30
                 format_date_labels(ax, rot=self.rot)
 
-            if index_name is not None:
+            if index_name is not None and self.use_index:
                 ax.set_xlabel(index_name)
 
 
@@ -1874,15 +1874,15 @@ def _post_plot_logic(self):
                 ax.set_xticklabels(str_index)
                 if not self.log: # GH3254+
                     ax.axhline(0, color='k', linestyle='--')
-                if name is not None:
+                if name is not None and self.use_index:
                     ax.set_xlabel(name)
             elif self.kind == 'barh':
                 # horizontal bars
                 ax.set_ylim((s_edge, e_edge))
                 ax.set_yticks(self.tick_pos)
                 ax.set_yticklabels(str_index)
                 ax.axvline(0, color='k', linestyle='--')
-                if name is not None:
+                if name is not None and self.use_index:
                     ax.set_ylabel(name)
             else:
                 raise NotImplementedError(self.kind)