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.
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