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                # finally從句 # `finally`從句 我們把我們的主程序代碼包裹進了`try`從句。然后我們把一些代碼包裹進一個`except`從句,它會在`try`從句中的代碼觸發異常時執行。 在下面的例子中,我們還會使用第三個從句,那就是`finally`從句。包裹到`finally`從句中的代碼不管異常是否觸發都將會被執行。這可以被用來在腳本執行之后做清理工作。這里是個簡單的例子: ~~~ try: file = open('test.txt', 'rb') except IOError as e: print('An IOError occurred. {}'.format(e.args[-1])) finally: print("This would be printed whether or not an exception occurred!") # Output: An IOError occurred. No such file or directory # This would be printed whether or not an exception occurred! ~~~
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