Backport PR #12630: Fix RcParams.__len__

jklymak · MeeseeksDev[bot] · commit 7b504fe4b575 · 2018-10-25T16:25:58.000Z
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
@@ -908,6 +908,9 @@ def __iter__(self):
         """Yield sorted list of keys."""
         yield from sorted(dict.__iter__(self))
 
+    def __len__(self):
+        return dict.__len__(self)
+
     def find_all(self, pattern):
         """
         Return the subset of this RcParams dictionary whose keys match,
