Creates a method descriptor from a MethodDescriptorProto.

    Args:
      method_proto: The proto describing the method.
      service_name: The name of the containing service.
      package: Optional package name to look up for types.
      scope: Scope containing available types.
      index: Index of the method in the service.

    Returns:
      An initialized MethodDescriptor object.

def _MakeMethodDescriptor(self, method_proto, service_name, package, scope,
                            index):
    """Creates a method descriptor from a MethodDescriptorProto.

    Args:
      method_proto: The proto describing the method.
      service_name: The name of the containing service.
      package: Optional package name to look up for types.
      scope: Scope containing available types.
      index: Index of the method in the service.

    Returns:
      An initialized MethodDescriptor object.
    """
    full_name = '.'.join((service_name, method_proto.name))
    input_type = self._GetTypeFromScope(
        package, method_proto.input_type, scope)
    output_type = self._GetTypeFromScope(
        package, method_proto.output_type, scope)
    return descriptor.MethodDescriptor(name=method_proto.name,
                                       full_name=full_name,
                                       index=index,
                                       containing_service=None,
                                       input_type=input_type,
                                       output_type=output_type,
                                       options=_OptionsOrNone(method_proto))