14.10 重新抛出最后的异常

## 问题 You caught an exception in an except block, but now you want to reraise it. ## 解决方案 Simply use the raise statement all by itself. For example: >>> def example(): ... try: ... int('N/A') ... except ValueError: ... print("Didn't work") ... raise ... >>> example() Didn't work Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in example ValueError: invalid literal for int() with base 10: 'N/A' >>> ## 讨论 This problem typically arises when you need to take some kind of action in response toan exception (e.g., logging, cleanup, etc.), but afterward, you simply want to propagatethe exception along. A very common use might be in catch-all exception handlers: try:...except Exception as e: # Process exception information in some way... # Propagate the exceptionraise