code: def _define_absl_flags(self, absl_flags):
      
      key_flags = set(absl_flags.get_key_flags_for_module(sys.argv[0]))
      for name in absl_flags:
        if name in _BUILT_IN_FLAGS:
          # Do not inherit built-in flags.
          continue
        flag_instance = absl_flags[name]
        # Each flags with short_name appears in FLAGS twice, so only define
        # when the dictionary key is equal to the regular name.
        if name == flag_instance.name:
          # Suppress the flag in the help short message if it's not a main
          # module's key flag.
          suppress = flag_instance not in key_flags
          self._define_absl_flag(flag_instance, suppress)
docs: Defines flags from absl_flags.