history_generator.py 文件源码

def run_to(self):
        try:
            advance_amount = int(self.years_box.get())

            if advance_amount > 0:
                self.advancing = True
                self.end_year = self.year + advance_amount

                self.after_id = self.parent.after(self.delay.get(), self.main_loop)
            else:
                self.end_year = self.year
                tkMessageBox.showerror('Negative Years', 'Cannot advance a negative or zero amount of time.')
        except ValueError:
            self.end_year = self.year
            tkMessageBox.showerror('Invalid Year', '"{}" is not a valid integer'.format(self.years_box.get()))
            return