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diff --git a/python/google/protobuf/pyext/descriptor_containers.h b/python/google/protobuf/pyext/descriptor_containers.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_CONTAINERS_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_CONTAINERS_H__
+
+// Mappings and Sequences of descriptors.
+// They implement containers like fields_by_name, EnumDescriptor.values...
+// See descriptor_containers.cc for more description.
+#include <Python.h>
+
+namespace google {
+namespace protobuf {
+
+class Descriptor;
+class FileDescriptor;
+class EnumDescriptor;
+class OneofDescriptor;
+class ServiceDescriptor;
+
+namespace python {
+
+// Initialize the various types and objects.
+bool InitDescriptorMappingTypes();
+
+// Each function below returns a Mapping, or a Sequence of descriptors.
+// They all return a new reference.
+
+namespace message_descriptor {
+PyObject* NewMessageFieldsByName(const Descriptor* descriptor);
+PyObject* NewMessageFieldsByCamelcaseName(const Descriptor* descriptor);
+PyObject* NewMessageFieldsByNumber(const Descriptor* descriptor);
+PyObject* NewMessageFieldsSeq(const Descriptor* descriptor);
+
+PyObject* NewMessageNestedTypesSeq(const Descriptor* descriptor);
+PyObject* NewMessageNestedTypesByName(const Descriptor* descriptor);
+
+PyObject* NewMessageEnumsByName(const Descriptor* descriptor);
+PyObject* NewMessageEnumsSeq(const Descriptor* descriptor);
+PyObject* NewMessageEnumValuesByName(const Descriptor* descriptor);
+
+PyObject* NewMessageExtensionsByName(const Descriptor* descriptor);
+PyObject* NewMessageExtensionsSeq(const Descriptor* descriptor);
+
+PyObject* NewMessageOneofsByName(const Descriptor* descriptor);
+PyObject* NewMessageOneofsSeq(const Descriptor* descriptor);
+}  // namespace message_descriptor
+
+namespace enum_descriptor {
+PyObject* NewEnumValuesByName(const EnumDescriptor* descriptor);
+PyObject* NewEnumValuesByNumber(const EnumDescriptor* descriptor);
+PyObject* NewEnumValuesSeq(const EnumDescriptor* descriptor);
+}  // namespace enum_descriptor
+
+namespace oneof_descriptor {
+PyObject* NewOneofFieldsSeq(const OneofDescriptor* descriptor);
+}  // namespace oneof_descriptor
+
+namespace file_descriptor {
+PyObject* NewFileMessageTypesByName(const FileDescriptor* descriptor);
+
+PyObject* NewFileEnumTypesByName(const FileDescriptor* descriptor);
+
+PyObject* NewFileExtensionsByName(const FileDescriptor* descriptor);
+
+PyObject* NewFileServicesByName(const FileDescriptor* descriptor);
+
+PyObject* NewFileDependencies(const FileDescriptor* descriptor);
+PyObject* NewFilePublicDependencies(const FileDescriptor* descriptor);
+}  // namespace file_descriptor
+
+namespace service_descriptor {
+PyObject* NewServiceMethodsSeq(const ServiceDescriptor* descriptor);
+PyObject* NewServiceMethodsByName(const ServiceDescriptor* descriptor);
+}  // namespace service_descriptor
+
+
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_CONTAINERS_H__