diff --git a/mlir/python/CMakeLists.txt b/mlir/python/CMakeLists.txt
--- a/mlir/python/CMakeLists.txt
+++ b/mlir/python/CMakeLists.txt
@@ -576,12 +576,18 @@
     "dialects/_python_test_ops_gen.py"
     -gen-python-op-bindings
     -bind-dialect=python_test)
+  mlir_tablegen(
+    "dialects/_python_test_enum_gen.py"
+    -gen-python-enum-bindings)
   add_public_tablegen_target(PythonTestDialectPyIncGen)
   declare_mlir_python_sources(
     MLIRPythonTestSources.Dialects.PythonTest.ops_gen
     ROOT_DIR "${CMAKE_CURRENT_BINARY_DIR}"
     ADD_TO_PARENT MLIRPythonTestSources.Dialects.PythonTest
-    SOURCES "dialects/_python_test_ops_gen.py")
+    SOURCES
+      "dialects/_python_test_ops_gen.py"
+      "dialects/_python_test_enum_gen.py"
+    )
 
   declare_mlir_python_extension(MLIRPythonTestSources.PythonTestExtension
     MODULE_NAME _mlirPythonTest
diff --git a/mlir/python/mlir/dialects/python_test.py b/mlir/python/mlir/dialects/python_test.py
--- a/mlir/python/mlir/dialects/python_test.py
+++ b/mlir/python/mlir/dialects/python_test.py
@@ -3,6 +3,7 @@
 #  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 from ._python_test_ops_gen import *
+from ._python_test_enum_gen import *
 from .._mlir_libs._mlirPythonTest import TestAttr, TestType, TestTensorValue, TestIntegerRankedTensorType
 
 
diff --git a/mlir/test/python/CMakeLists.txt b/mlir/test/python/CMakeLists.txt
--- a/mlir/test/python/CMakeLists.txt
+++ b/mlir/test/python/CMakeLists.txt
@@ -7,6 +7,8 @@
 mlir_tablegen(lib/PythonTestAttributes.cpp.inc -gen-attrdef-defs)
 mlir_tablegen(lib/PythonTestTypes.h.inc -gen-typedef-decls)
 mlir_tablegen(lib/PythonTestTypes.cpp.inc -gen-typedef-defs)
+mlir_tablegen(lib/PythonTestEnums.h.inc -gen-enum-decls)
+mlir_tablegen(lib/PythonTestEnums.cpp.inc -gen-enum-defs)
 add_public_tablegen_target(MLIRPythonTestIncGen)
 
 add_subdirectory(lib)
diff --git a/mlir/test/python/dialects/python_test.py b/mlir/test/python/dialects/python_test.py
--- a/mlir/test/python/dialects/python_test.py
+++ b/mlir/test/python/dialects/python_test.py
@@ -487,3 +487,22 @@
             two_operands = test.InferResultsVariadicInputsOp(single=zero, doubled=zero)
             # CHECK: f32
             print(two_operands.result.type)
+
+
+# CHECK-LABEL: TEST: testBitEnum
+@run
+def testBitEnum():
+    with Context() as ctx, Location.unknown(ctx):
+        test.register_python_test_dialect(ctx)
+        module = Module.create()
+        with InsertionPoint(module.body):
+            op = test.OpWithBareBitEnumVerticalBar(1)
+            # CHECK: python_test.op_with_bit_bar_enum_vbar user
+            print(op)
+            op = test.OpWithBareBitEnumVerticalBar(2)
+            # CHECK: python_test.op_with_bit_bar_enum_vbar group
+            print(op)
+            op = test.OpWithBareBitEnumVerticalBar(1 | 2)
+            # CHECK: python_test.op_with_bit_bar_enum_vbar user | group
+            print(op)
+        print(module.body)
diff --git a/mlir/test/python/lib/PythonTestDialect.h b/mlir/test/python/lib/PythonTestDialect.h
--- a/mlir/test/python/lib/PythonTestDialect.h
+++ b/mlir/test/python/lib/PythonTestDialect.h
@@ -12,6 +12,7 @@
 #include "mlir/IR/Dialect.h"
 #include "mlir/IR/OpImplementation.h"
 #include "mlir/Interfaces/InferTypeOpInterface.h"
+#include "llvm/ADT/StringExtras.h"
 
 #include "PythonTestDialect.h.inc"
 
@@ -24,4 +25,29 @@
 #define GET_TYPEDEF_CLASSES
 #include "PythonTestTypes.h.inc"
 
+namespace python_test {
+inline std::string stringifyTestBitEnumVerticalBar(llvm::APInt symbol) {
+  auto val = static_cast<uint32_t>(symbol.getLimitedValue());
+  assert(7u == (7u | val) && "invalid bits set in bit enum");
+  ::llvm::SmallVector<::llvm::StringRef, 2> strs;
+
+  if (1u == (1u & val))
+    strs.push_back("user");
+
+  if (2u == (2u & val))
+    strs.push_back("group");
+
+  if (4u == (4u & val))
+    strs.push_back("other");
+  return llvm::join(strs, " | ");
+}
+// ::mlir::ParseResult OpWithBareBitEnumVerticalBar::parse ...
+// valueAttr =
+// parser.getBuilder().getIntegerAttr(parser.getBuilder().getIntegerType(32),
+// static_cast<uint32_t>(*attrOptional));
+
+} // namespace python_test
+
+#include "PythonTestEnums.h.inc"
+
 #endif // MLIR_TEST_PYTHON_LIB_PYTHONTESTDIALECT_H
diff --git a/mlir/test/python/lib/PythonTestDialect.cpp b/mlir/test/python/lib/PythonTestDialect.cpp
--- a/mlir/test/python/lib/PythonTestDialect.cpp
+++ b/mlir/test/python/lib/PythonTestDialect.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/TypeSwitch.h"
 
 #include "PythonTestDialect.cpp.inc"
+#include "PythonTestEnums.cpp.inc"
 
 #define GET_ATTRDEF_CLASSES
 #include "PythonTestAttributes.cpp.inc"
diff --git a/mlir/test/python/python_test_ops.td b/mlir/test/python/python_test_ops.td
--- a/mlir/test/python/python_test_ops.td
+++ b/mlir/test/python/python_test_ops.td
@@ -12,6 +12,7 @@
 include "mlir/IR/AttrTypeBase.td"
 include "mlir/IR/OpBase.td"
 include "mlir/Interfaces/InferTypeOpInterface.td"
+include "mlir/IR/EnumAttr.td"
 
 def Python_Test_Dialect : Dialect {
   let name = "python_test";
@@ -181,4 +182,23 @@
   let results = (outs I32:$result);
 }
 
+// Define an enum with a different separator
+def TestBitEnumVerticalBar
+    : I32BitEnumAttr<"TestBitEnumVerticalBar", "another test bit enum", [
+        I32BitEnumAttrCaseBit<"User", 0, "user">,
+        I32BitEnumAttrCaseBit<"Group", 1, "group">,
+        I32BitEnumAttrCaseBit<"Other", 2, "other">,
+      ]> {
+  let genSpecializedAttr = 0;
+  let cppNamespace = "python_test";
+  let separator = " | ";
+}
+
+// Define an op that contains the bare enum attribute.
+def OpWithBareBitEnumVerticalBar : TestOp<"op_with_bit_bar_enum_vbar"> {
+  let arguments = (ins TestBitEnumVerticalBar:$value,
+                   OptionalAttr<AnyAttr>:$tag);
+  let assemblyFormat = "$value (`tag` $tag^)? attr-dict";
+}
+
 #endif // PYTHON_TEST_OPS