# try/else从句

我们常常想在没有触发异常的时候执行一些代码。这可以很轻松地通过一个 `else` 从句来达到。

有人也许问了：如果你只是想让一些代码在没有触发异常的情况下执行，为啥你不直接把代码放在 `try` 里面呢？\
回答是，那样的话这段代码中的任意异常都还是会被 `try` 捕获，而你并不一定想要那样。

大多数人并不使用 `else` 从句，而且坦率地讲我自己也没有大范围使用。这里是个例子：

```python
try:
    print('I am sure no exception is going to occur!')
except Exception:
    print('exception')
else:
    # 这里的代码只会在try语句里没有触发异常时运行,
    # 但是这里的异常将 *不会* 被捕获
    print('This would only run if no exception occurs. And an error here '
          'would NOT be caught.')
finally:
    print('This would be printed in every case.')

# Output: I am sure no exception is going to occur!
# This would only run if no exception occurs.
# This would be printed in every case.
```

`else` 从句只会在没有异常的情况下执行，而且它会在 `finally` 语句之前执行。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://eastlakeside.gitbook.io/interpy-zh/exception/multiple_exception/try_else_clause.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.