docs: def proto_refactor(proto_filename, namespace, namespace_path):
      """This method refactors a Protobuf file to import from a namespace
      that will map to the desired python package structure. It also ensures
      that the syntax is set to "proto2", since protoc complains without it.
  
      Args:
          proto_filename (str): the protobuf filename to be refactored
          namespace (str): the desired package name (i.e. "dropsonde.py2")
          namespace_path (str): the desired path corresponding to the package
                                name (i.e. "dropsonde/py2")
      """
      with open(proto_filename) as f:
          data = f.read()
          if not re.search('syntax = "proto2"', data):
              insert_syntax = 'syntax = "proto2";\n'
              data = insert_syntax + data
          substitution = 'import "{}/\\1";'.format(namespace_path)
          data = re.sub('import\s+"([^"]+\.proto)"\s*;', substitution, data)
          return data