Simplified ListMixin.sort().

django/contrib/gis/geos/mutable_list.py

@@ -210,19 +210,9 @@ class ListMixin:
         "Standard list reverse method"
         self[:] = self[-1::-1]
 
-    def sort(self, cmp=None, key=None, reverse=False):
+    def sort(self, key=None, reverse=False):
         "Standard list sort method"
-        if key:
-            temp = [(key(v), v) for v in self]
-            temp.sort(key=lambda x: x[0], reverse=reverse)
-            self[:] = [v[1] for v in temp]
-        else:
-            temp = list(self)
-            if cmp is not None:
-                temp.sort(cmp=cmp, reverse=reverse)
-            else:
-                temp.sort(reverse=reverse)
-            self[:] = temp
+        self[:] = sorted(self, key=key, reverse=reverse)
 
     # ### Private routines ###
     def _rebuild(self, newLen, newItems):