def arg_name(self):
        """Return argument name associated with given param."""
        if len(self.args) > 2:
            return self.args[2]
        elif len(self.args) > 1:
            return self.args[1]
        return None
def arg_name ( self ) : if len ( self . args ) > 2 : return self . args [ 2 ] elif len ( self . args ) > 1 : return self . args [ 1 ] return None
Return argument name associated with given param.