fixed color keyword in time series plot - issue pandas-dev#1890

Author: brendam

pandas/tests/test_graphics.py

@@ -489,6 +489,16 @@ def test_series_plot_color_kwargs(self):
         line = ax.get_lines()[0]
         self.assert_(line.get_color() == 'green')
 
+    @slow
+    def test_time_series_plot_color_kwargs(self):
+        # #1890
+        import matplotlib.pyplot as plt
+
+        plt.close('all')
+        ax = Series(np.arange(12) + 1, index=date_range('1/1/2000', periods=12)).plot(color='green')
+        line = ax.get_lines()[0]
+        self.assert_(line.get_color() == 'green')
+
 PNG_PATH = 'tmp.png'
 
 def _check_plot_works(f, *args, **kwargs):

pandas/tools/plotting.py

@@ -936,7 +936,8 @@ def _make_ts_plot(self, data, **kwargs):
 
         def _maybe_add_color(kwargs, style, i):
             if (not has_colors and
-                (style is None or re.match('[a-z]+', style) is None)):
+                (style is None or re.match('[a-z]+', style) is None)
+                   and 'color' not in kwargs):
                 kwargs['color'] = colors[i % len(colors)]
 
         def to_leg_label(label, i):