def tuple ( self , var , cast = None , default = NOTSET ) : return self . get_value ( var , cast = tuple if not cast else ( cast , ) , default = default )
python tuple and default value
: rtype : tuple
def tuple(self, var, cast=None, default=NOTSET):
        """
        :rtype: tuple
        """
        return self.get_value(var, cast=tuple if not cast else (cast,), default=default)