# finally从句

我们把我们的主程序代码包裹进了 `try` 从句。然后我们把一些代码包裹进一个 `except` 从句，它会在 `try` 从句中的代码触发异常时执行。

在下面的例子中，我们还会使用第三个从句，那就是 `finally` 从句。包裹到 `finally` 从句中的代码不管异常是否触发都将会被执行。这可以被用来在脚本执行之后做清理工作。这里是个简单的例子：

```python
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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