BREAKING CHANGE in v26: Reject extend repeated field with none iterable (Raise TypeError)

For example m.repeated_int32.extend(None) will be rejected

PiperOrigin-RevId: 595840357

python/google/protobuf/internal/containers.py

@@ -136,17 +136,7 @@ class RepeatedScalarFieldContainer(BaseContainer[_T], MutableSequence[_T]):
 
   def extend(self, elem_seq: Iterable[_T]) -> None:
     """Extends by appending the given iterable. Similar to list.extend()."""
-# TODO: Change OSS to raise error too
-    if elem_seq is None:
-      return
-    try:
-      elem_seq_iter = iter(elem_seq)
-    except TypeError:
-      if not elem_seq:
-        warnings.warn('Value is not iterable. Please remove the wrong '
-                      'usage. This will be changed to raise TypeError soon.')
-        return
-      raise
+    elem_seq_iter = iter(elem_seq)
     new_values = [self._type_checker.CheckValue(elem) for elem in elem_seq_iter]
     if new_values:
       self._values.extend(new_values)

python/google/protobuf/internal/message_test.py

@@ -1012,6 +1012,12 @@ class MessageTest(unittest.TestCase):
     m = message_module.TestAllTypes()
     self.assertSequenceEqual([], m.repeated_int32)
 
+    for falsy_value in MessageTest.FALSY_VALUES:
+      with self.assertRaises(TypeError) as context:
+        m.repeated_int32.extend(falsy_value)
+      self.assertIn('iterable', str(context.exception))
+      self.assertSequenceEqual([], m.repeated_int32)
+
     for empty_value in MessageTest.EMPTY_VALUES:
       m.repeated_int32.extend(empty_value)
       self.assertSequenceEqual([], m.repeated_int32)
@@ -1021,6 +1027,12 @@ class MessageTest(unittest.TestCase):
     m = message_module.TestAllTypes()
     self.assertSequenceEqual([], m.repeated_float)
 
+    for falsy_value in MessageTest.FALSY_VALUES:
+      with self.assertRaises(TypeError) as context:
+        m.repeated_float.extend(falsy_value)
+      self.assertIn('iterable', str(context.exception))
+      self.assertSequenceEqual([], m.repeated_float)
+
     for empty_value in MessageTest.EMPTY_VALUES:
       m.repeated_float.extend(empty_value)
       self.assertSequenceEqual([], m.repeated_float)
@@ -1030,6 +1042,12 @@ class MessageTest(unittest.TestCase):
     m = message_module.TestAllTypes()
     self.assertSequenceEqual([], m.repeated_string)
 
+    for falsy_value in MessageTest.FALSY_VALUES:
+      with self.assertRaises(TypeError) as context:
+        m.repeated_string.extend(falsy_value)
+      self.assertIn('iterable', str(context.exception))
+      self.assertSequenceEqual([], m.repeated_string)
+
     for empty_value in MessageTest.EMPTY_VALUES:
       m.repeated_string.extend(empty_value)
       self.assertSequenceEqual([], m.repeated_string)

python/google/protobuf/pyext/repeated_scalar_container.cc

@@ -443,20 +443,6 @@ static int AssSubscript(PyObject* pself, PyObject* slice, PyObject* value) {
 PyObject* Extend(RepeatedScalarContainer* self, PyObject* value) {
   cmessage::AssureWritable(self->parent);
 
-  // TODO: Remove this in OSS
-  if (value == Py_None) {
-    PyErr_Warn(nullptr,
-               "Value is not iterable. Please remove the wrong usage."
-               " This will be changed to raise TypeError soon.");
-    Py_RETURN_NONE;
-  }
-  if ((Py_TYPE(value)->tp_as_sequence == nullptr) && PyObject_Not(value)) {
-    PyErr_Warn(nullptr,
-               "Value is not iterable. Please remove the wrong usage."
-               " This will be changed to raise TypeError soon.");
-    Py_RETURN_NONE;
-  }
-
   ScopedPyObjectPtr iter(PyObject_GetIter(value));
   if (iter == nullptr) {
     PyErr_SetString(PyExc_TypeError, "Value must be iterable");