Import MutableSequence from collections.abc on Python 3. (#6272)

Fixes #5335.
protocolbuffers · Nov 12, 2019 · 9d61ead · 9d61ead
1 parent 9b0fa3e
commit 9d61ead
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/python/google/protobuf/pyext/message.cc b/python/google/protobuf/pyext/message.cc
@@ -2958,8 +2958,12 @@ bool InitProto2MessageModule(PyObject *m) {
         reinterpret_cast<PyObject*>(
             &RepeatedCompositeContainer_Type));
 
-    // Register them as collections.Sequence
+    // Register them as MutableSequence.
+#if PY_MAJOR_VERSION >= 3
+    ScopedPyObjectPtr collections(PyImport_ImportModule("collections.abc"));
+#else
     ScopedPyObjectPtr collections(PyImport_ImportModule("collections"));
+#endif
     if (collections == NULL) {
       return false;
     }