matplotlib
diff --git a/‎lib/matplotlib/backend_bases.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backend_bases.py
+5Lines changed: 5 additions & 0 deletions b/‎lib/matplotlib/backend_bases.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backend_bases.py
+5Lines changed: 5 additions & 0 deletions
@@ -1011,6 +1011,11 @@ def set_graylevel(self, frac):
         """
         Set the foreground color to be a gray level with *frac*
         """
+        # When removing, remember to remove all overrides in subclasses.
+        msg = ("set_graylevel is deprecated for removal in 1.6; "
+                "you can achieve the same result by using "
+                "set_foreground((frac, frac, frac))")
+        warnings.warn(msg, mplDeprecation)
         self._rgb = (frac, frac, frac, self._alpha)
 
     def set_joinstyle(self, js):