FIX: allow single-string color for scatter

jklymak · jklymak · commit e5421ab3cfb4 · 2018-10-07T10:10:13.000-07:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -4184,7 +4184,7 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
         valid_shape = True  # will be put to the test!
         n_elem = -1  # used only for (some) exceptions
 
-        if c_none or co is not None:
+        if c_none or co is not None or isinstance(c, str):
             c_array = None
         else:
             try:  # First, does 'c' look suitable for value-mapping?
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -1745,6 +1745,8 @@ def test_scatter_color(self):
     # scatter plot will have 4 elements. The tuple scheme is:
     # (*c* parameter case, exception regexp key or None if no exception)
     params_test_scatter_c = [
+        # single string:
+        ('0.5', None),
         # Single letter-sequences
         ("rgby", None),
         ("rgb", "shape"),
