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class Resource():    def __enter__(self):        print('===connect to resource===')        return self    def __exit__(self, exc_type, exc_val, exc_tb):        print('===close resource connection===')        return True #告诉python解释器异常已处理        return False #告诉python解释器抛出异常    def operate(self):        1/0import contextlib@contextlib.contextmanagerdef open_func(file_name):    # __enter__方法    print('open file:', file_name, 'in __enter__')    file_handler = open(file_name, 'r')    try:        yield file_handler # yield后相当于__exit__    except Exception as exc:        # deal with exception        raise Exception(str(exc))        print('the exception was thrown: {}'.format(str(exc)))    finally:        print('close file:', file_name, 'in __exit__')        file_handler.close()        returnimport osfrom functools import partialfile_path = os.path.dirname(os.path.abspath(__file__))get_file_path = partial(os.path.join, file_path)print(get_file_path("deploy.sh"))if __name__ == "__main__":    with open_func(get_file_path("deploy.sh")) as file_in:        for line in file_in:            # 1/0            print(line)    # with Resource() as res:    #     res.operate()

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