Added GetDebugString to Python FileDescriptor interface.

python/google/protobuf/internal/descriptor_test.py

@@ -51,6 +51,28 @@ TEST_EMPTY_MESSAGE_DESCRIPTOR_ASCII = """
 name: 'TestEmptyMessage'
 """
 
+TEST_FILE_DESCRIPTOR_DEBUG = """syntax = "proto2";
+
+package protobuf_unittest;
+
+message NestedMessage {
+  enum ForeignEnum {
+    FOREIGN_FOO = 4;
+    FOREIGN_BAR = 5;
+    FOREIGN_BAZ = 6;
+  }
+  optional int32 bb = 1;
+}
+
+message ResponseMessage {
+}
+
+service Service {
+  rpc CallMethod(.protobuf_unittest.NestedMessage) returns (.protobuf_unittest.ResponseMessage);
+}
+
+"""
+
 
 warnings.simplefilter('error', DeprecationWarning)
 
@@ -121,6 +143,9 @@ class DescriptorTest(unittest.TestCase):
   def testContainingServiceFixups(self):
     self.assertEqual(self.my_service, self.my_method.containing_service)
 
+  def testGetDebugString(self):
+    self.assertEqual(self.my_file.GetDebugString(), TEST_FILE_DESCRIPTOR_DEBUG)
+
   def testGetOptions(self):
     self.assertEqual(self.my_enum.GetOptions(),
                      descriptor_pb2.EnumOptions())

python/google/protobuf/pyext/descriptor.cc

@@ -1393,6 +1393,10 @@ static int SetHasOptions(PyFileDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("has_options");
 }
 
+static PyObject* GetDebugString(PyFileDescriptor *self) {
+  return PyString_FromCppString(_GetDescriptor(self)->DebugString());
+}
+
 static PyObject* GetOptions(PyFileDescriptor *self) {
   return GetOrBuildOptions(_GetDescriptor(self));
 }
@@ -1439,6 +1443,7 @@ static PyGetSetDef Getters[] = {
 };
 
 static PyMethodDef Methods[] = {
+  { "GetDebugString", (PyCFunction)GetDebugString, METH_NOARGS, },
   { "GetOptions", (PyCFunction)GetOptions, METH_NOARGS, },
   { "CopyToProto", (PyCFunction)CopyToProto, METH_O, },
   {NULL}