BUG: Dont add None to plot legend.

Author: TomAugspurger

pandas/tests/test_graphics.py

@@ -2477,6 +2477,16 @@ def test_style_by_column(self):
             for i, l in enumerate(ax.get_lines()[:len(markers)]):
                 self.assertEqual(l.get_marker(), markers[i])
 
+    @slow
+    def test_line_label_none(self):
+        s = Series([1, 2])
+        ax = s.plot()
+        self.assertEqual(ax.get_legend(), None)
+
+        ax = s.plot(legend=True)
+        self.assertEqual(ax.get_legend().get_texts()[0].get_text(),
+                         'None')
+
     @slow
     def test_line_colors(self):
         import sys

pandas/tools/plotting.py

@@ -2456,7 +2456,7 @@ def plot_frame(data, x=None, y=None, kind='line', ax=None,                 # Dat
 @Appender(_shared_docs['plot'] % _shared_doc_series_kwargs)
 def plot_series(data, kind='line', ax=None,                    # Series unique
                 figsize=None, use_index=True, title=None, grid=None,
-                legend=True, style=None, logx=False, logy=False, loglog=False,
+                legend=False, style=None, logx=False, logy=False, loglog=False,
                 xticks=None, yticks=None, xlim=None, ylim=None,
                 rot=None, fontsize=None, colormap=None, table=False,
                 yerr=None, xerr=None,