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Ensures that only one flag among flag_names is True.

    flag_names, required=False, flag_values=_flagvalues.FLAGS


  • flag_names: [str], names of the flags.
  • required: bool. If true, exactly one flag must be True. Otherwise, at most one flag can be True, and it is valid for all flags to be False.
  • flag_values: flags.FlagValues, optional FlagValues instance where the flags are defined.