MutableSequence requires an insert() method.

6cc14a05 · Raymond Hettinger · b8b6d3ef · 6cc14a05
Commit 6cc14a05 authored Feb 06, 2008 by Raymond Hettinger
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Lib/UserString.py Lib/UserString.py +2 -0

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--- a/Lib/UserString.py
+++ b/Lib/UserString.py
@@ -232,6 +232,8 @@ class MutableString(UserString, collections.MutableSequence):
    def __imul__(self, n):
        self.data *= n
        return self
+    def insert(self, index, value):
+        self[index:index] = value

 collections.MutableSequence.register(MutableString)