diff --git a/mlir/lib/Bindings/Python/IRCore.cpp b/mlir/lib/Bindings/Python/IRCore.cpp
--- a/mlir/lib/Bindings/Python/IRCore.cpp
+++ b/mlir/lib/Bindings/Python/IRCore.cpp
@@ -2105,10 +2105,6 @@
           },
           "Shortcut to get an op result if it has only one (throws an error "
           "otherwise).")
-      .def("__iter__",
-           [](PyOperationBase &self) {
-             return PyRegionIterator(self.getOperation().getRef());
-           })
       .def(
           "__str__",
           [](PyOperationBase &self) {
diff --git a/mlir/python/mlir/dialects/_builtin_ops_ext.py b/mlir/python/mlir/dialects/_builtin_ops_ext.py
--- a/mlir/python/mlir/dialects/_builtin_ops_ext.py
+++ b/mlir/python/mlir/dialects/_builtin_ops_ext.py
@@ -197,6 +197,8 @@
             return_values = []
           elif isinstance(return_values, Value):
             return_values = [return_values]
+          elif isinstance(return_values, OpView):
+            return_values = return_values.results
           else:
             return_values = list(return_values)
           std.ReturnOp(return_values)
diff --git a/mlir/test/python/dialects/math.py b/mlir/test/python/dialects/math.py
--- a/mlir/test/python/dialects/math.py
+++ b/mlir/test/python/dialects/math.py
@@ -19,7 +19,7 @@
         return mlir_math.SqrtOp(F32Type.get(), arg)
 
     # CHECK-LABEL: func @emit_sqrt(
-    # CHECK-SAME:                  %[[ARG:.*]]: f32) {
+    # CHECK-SAME:                  %[[ARG:.*]]: f32) -> f32 {
     # CHECK:         math.sqrt %[[ARG]] : f32
     # CHECK:         return
     # CHECK:       }
diff --git a/mlir/test/python/ir/operation.py b/mlir/test/python/ir/operation.py
--- a/mlir/test/python/ir/operation.py
+++ b/mlir/test/python/ir/operation.py
@@ -36,7 +36,7 @@
   print(f".verify = {module.operation.verify()}")
 
   # Get the regions and blocks from the default collections.
-  default_regions = list(op)
+  default_regions = list(op.regions)
   default_blocks = list(default_regions[0])
   # They should compare equal regardless of how obtained.
   assert default_regions == regions
@@ -49,7 +49,7 @@
   assert default_operations == operations
 
   def walk_operations(indent, op):
-    for i, region in enumerate(op):
+    for i, region in enumerate(op.regions):
       print(f"{indent}REGION {i}:")
       for j, block in enumerate(region):
         print(f"{indent}  BLOCK {j}:")