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Commit fbf22ef

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提交示例代码
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‎xuanyuanyulong/2020-08-24-python-with-statement/__init__.py‎

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JUST
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DO
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PYTHON
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class testContextManager:
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def __enter__(self):
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print("进入运行时上下文,调用__enter__方法")
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def __exit__(self, exc_type, exc_value, traceback):
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print("退出运行时上下文,调用__exit__方法")
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with testContextManager() as o:
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pass
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with open("test.txt", "r", encoding="utf-8") as f:
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s = f.readlines()
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print(s)
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# try:
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# f = open("test.txt", "a", encoding="utf-8")
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# s = f.readlines()
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# except:
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# print("出现异常")
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# finally:
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# f.close()

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