05.01.19 14:52, Moon丶sun пише:
As we know,when we import the module--'contextlib',we can use the decorator '@contextmanager' and keyword ‘yield’ to make a 'instance' of Class '_GeneratorContextManager' in 'contextlib' module,then we can use it like: with 'instance' as 'xx': 'code block' pass But there is a little bug,when the code block raise a error,the instance cannot run the code which after the keyword 'yield'.
This is not a bug.
Consider the following example:
@contextmanager def cm(): try: yield except BaseException as err: print('Fail:', err) raise else: print('Success')
with cm(): 1/0
What result would you expect? Test it with the stdlib implementation and with your implementation.