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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def RegisterPathSpec(cls, path_spec_type):
 """Registers a path specification type. Args: path_spec_type (type):
 path specification type. Raises: KeyError: if path specification is already registered. """

    type_indicator = path_spec_type.TYPE_INDICATOR
    if type_indicator in cls._path_spec_types:
      raise KeyError(
          'Path specification type: {0:s} already set.'.format(
              type_indicator))

    cls._path_spec_types[type_indicator] = path_spec_type

    if getattr(path_spec_type, '_IS_SYSTEM_LEVEL', False):
      cls._system_level_type_indicators[type_indicator] = path_spec_type