calc.py 文件源码

def __init__(self, op, letter):
        """Use the operator and letter of the child column as caption

        op -- operator or None
        letter -- letter of child column
        remove_fn -- function to call when user wants to remove child
                     function takes no parameters
        """

        urwid.Edit.__init__(self, layout=CALC_LAYOUT)
        self.op = op
        self.set_letter( letter )