settings.py 文件源码

def add_option(self, key, default, *, reset=True):
        """Add a new option without adding widgets to the setting dialog.

        ``section[key]`` will be *default* unless something else is
        specified.

        If *reset* is True, the setting dialog's reset button sets this
        option to *default*.

        .. note::
            The *reset* argument should be False for settings that
            cannot be changed with the dialog. That way, clicking the
            reset button resets only the settings that are shown in the
            dialog.
        """
        self._infos[key] = types.SimpleNamespace(
            default=default,        # not validated
            reset=reset,
            callbacks=[],
            errorvar=tkinter.BooleanVar(),  # true when the triangle is showing
        )