Selenium2Library系列 keywords 之 _SelectElementKeywords 之 unselect_from_list(self, locator, *items)

    def unselect_from_list(self, locator, *items):
        """Unselects given values from select list identified by locator.

        As a special case, giving empty list as `*items` will remove all
        selections.

        *items try to unselect by value AND by label.

        It's faster to use 'by index/value/label' functions.

        Select list keywords work on both lists and combo boxes. Key attributes for
        select lists are `id` and `name`. See `introduction` for details about
        locating elements.
        """
        items_str = items and "option(s) '%s'" % ", ".join(items) or "all options"
        self._info("Unselecting %s from list '%s'." % (items_str, locator))

        select = self._get_select_list(locator)
        if not select.is_multiple:
            raise RuntimeError("Keyword 'Unselect from list' works only for multiselect lists.")

        if not items:
            select.deselect_all()
            return

        select, options = self._get_select_list_options(select)
        for item in items:
            select.deselect_by_value(item)
            select.deselect_by_visible_text(item)

方法名：unselect_from_list(self, locator, *items)

相似方法：

公共方法 移除所给items的选中状态

接收参数：locator，*labels/*values

18行：使用_get_select_list(self, locator)方法，返回Select对象