parameters: (name, default, help, flag_values=FLAGS, **args)
docstring: Registers a boolean flag.
  
    Such a boolean flag does not take an argument.  If a user wants to
    specify a false value explicitly, the long option beginning with 'no'
    must be used: i.e. --noflag
  
    This flag will have a value of None, True or False.  None is possible
    if default=None and the user does not specify the flag on the command
    line.
docstring_summary: Registers a boolean flag.
docstring_tokens: Registers a boolean flag .
function: def DEFINE_boolean(name, default, help, flag_values=FLAGS, **args):
    """Registers a boolean flag.
  
    Such a boolean flag does not take an argument.  If a user wants to
    specify a false value explicitly, the long option beginning with 'no'
    must be used: i.e. --noflag
  
    This flag will have a value of None, True or False.  None is possible
    if default=None and the user does not specify the flag on the command
    line.
    """
    DEFINE_flag(BooleanFlag(name, default, help, **args), flag_values)
function_tokens: def DEFINE_boolean ( name , default , help , flag_values = FLAGS , * * args ) : DEFINE_flag ( BooleanFlag ( name , default , help , * * args ) , flag_values )