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python 双层 try-except

时间: 2024-12-30 13:29:31 浏览: 57

### 实现双层 `try-except` 结构在 Python 中，可以轻松地创建多层 `try-except` 块来处理不同层次上的异常。这种结构允许更精细地控制异常处理逻辑，并能针对不同的代码段提供特定的错误处理机制。下面是一个具体的例子展示了如何构建两层嵌套的 `try-except`： ```python def outer_function(): try: print("Outer try block starts") def inner_function(): try: print("Inner try block starts") # 可能引发异常的操作 result = 10 / int('a') # 此处会触发 ValueError 异常 print(f"Result is {result}") except ZeroDivisionError as e: print(f"Caught an exception inside inner function: {e}[^3]") finally: print("Finally of inner try block executes regardless of exceptions.") inner_function() except Exception as e: print(f"An unexpected error occurred in the outer function: {e}") else: print("No exceptions were raised.") finally: print("This will always execute after trying to run the code within this scope.") outer_function() ``` 在这个例子中，当尝试执行 `int('a')` 转换时会发生一个 `ValueError` 错误，在内层 `try-except` 中并没有捕捉到这个类型的异常，因此它将被传递给外层的 `except Exception as e:` 处理器进行处理。

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