python上下文管理的使用场景

>>> with Context():

...     raise Exception # 直接抛出异常

...

enter context

exit context

Traceback (most recent call last):

  File "/usr/local/python3/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 2862, in run_code

    exec(code_obj, self.user_global_ns, self.user_ns)

  File "<ipython-input-4-63ba5aff5acc>", line 2, in <module>

    raise Exception

Exception