eliminate conversion to list and assignment of cid

eendebakpt · eendebakpt · commit 735038f48e6d · 2023-07-13T19:37:49.000+02:00
diff --git a/lib/matplotlib/cbook.py b/lib/matplotlib/cbook.py
@@ -286,7 +286,7 @@ def process(self, s, *args, **kwargs):
         """
         if self._signals is not None:
             _api.check_in_list(self._signals, signal=s)
-        for cid, ref in list(self.callbacks.get(s, {}).items()):
+        for ref in self.callbacks.get(s, {}).values():
             func = ref()
             if func is not None:
                 try:
