Try plt.draw() instead of canvas.draw() to fix issue on osx 3.5.

Author: jgoppert

pandas/tests/plotting/test_datetimelike.py

@@ -1282,7 +1282,7 @@ def test_format_timedelta_ticks_narrow(self):
         rng = timedelta_range('0', periods=10, freq='ns')
         df = DataFrame(np.random.randn(len(rng), 3), rng)
         ax = df.plot(fontsize=2)
-        ax.get_figure().canvas.draw()
+        plt.draw()
         plt.gcf().autofmt_xdate()
         labels = ax.get_xticklabels()
         self.assertEqual(len(labels), len(expected_labels))
@@ -1308,7 +1308,7 @@ def test_format_timedelta_ticks_wide(self):
         rng = timedelta_range('0', periods=10, freq='1 d')
         df = DataFrame(np.random.randn(len(rng), 3), rng)
         ax = df.plot(fontsize=2)
-        ax.get_figure().canvas.draw()
+        plt.draw()
         plt.gcf().autofmt_xdate()
         labels = ax.get_xticklabels()
         self.assertEqual(len(labels), len(expected_labels))