def load(self, filename, create_if_missing=True):
        filename = Path(filename)
        if not filename.exists() and create_if_missing:
            self.load_pip_requirements()
            with filename.open("w") as f:
                f.write(yaml.dump(self.serialized, default_flow_style=False,
                                  encoding=None))
            self.filename = filename
            return self.save(filename)
        with filename.open() as f:
            for group, requirements in yaml.load(f.read()).items():
                for requirement in requirements:
                    self[group].add(Requirement.coerce(requirement))
        self.filename = filename
def ask_YesOrNo(self, info):
        yui.YUI.widgetFactory
        mgafactory = yui.YMGAWidgetFactory.getYMGAWidgetFactory(yui.YExternalWidgets.externalWidgetFactory("mga"))
        dlg = mgafactory.createDialogBox(yui.YMGAMessageBox.B_TWO)
        dlg.setTitle(info.title)
        dlg.setText(info.text, info.richtext)
        dlg.setButtonLabel("Yes", yui.YMGAMessageBox.B_ONE)
        dlg.setButtonLabel("No",  yui.YMGAMessageBox.B_TWO)
        dlg.setMinSize(50, 5);
        return dlg.show() == yui.YMGAMessageBox.B_ONE