从上下文管理器中止执行with语句

with 上下文管理器 as 变量:
    # 代码块

class MyContextManager:
    def __enter__(self):
        # 获取资源
        print("获取资源")
        return self
    
    def __exit__(self, exc_type, exc_value, traceback):
        # 释放资源
        print("释放资源")
    
    def do_something(self):
        # 业务逻辑
        print("执行业务逻辑")
        raise Exception("异常")

with MyContextManager() as manager:
    manager.do_something()

获取资源
执行业务逻辑
释放资源
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "<stdin>", line 8, in do_something
Exception: 异常