以下Python代码执行后，控制台的输出结果是？
0
[已关闭问题]
关闭于 2025-11-24 13:07
class ResourceHandler:
def __enter__(self): print("Resource acquired") return self def __exit__(self, exc_type, exc_val, exc_tb): print("Resource released") return Truetry: with ResourceHandler(): print("Processing resource") raise RuntimeError("Failure")except RuntimeError: print("Exception caught")A
Resource acquired → Processing resource → Resource released → Exception caught
B
Resource acquired → Processing resource → Resource released
C
Resource acquired → Resource released → Processing resource → Exception caught
D
Resource acquired → Processing resource → Exception caught → Resource released
正确答案：B
官方解析：
在Python上下文管理器中，`__enter__`方法在进入`with`块时调用，打印'Resource acquired'；然后执行`with`块内的代码，打印'Processing resource'并引发`RuntimeError`异常；退出`with`块时调用`__exit__`方法，打印'Resource released'，且`__exit__`返回`True`表示异常被抑制，因此异常不会传播到外部`try-except`块，'except RuntimeError'块不会执行，故'Exception caught'未打印。输出顺序为Resource acquired → Processing resource → Resource released。选项A、C、D均错误：A多出'Exception caught'；C顺序错误（Resource released在Processing resource前）；D顺序错误且多出'Exception caught'。
