python魔术方法--上下文管理

[python]代码库

class Point:
    def __init__(self):
        print('init')

    def __enter__(self):
        print('enter'+self.__class__.__name__)
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        print('exit'+self.__class__.__name__)
        print(exc_tb)
        print(exc_val)
        print(exc_type)

p = Point()

with p as f:
    # raise Exception('Error123')
    print(f == p)
    print(f is p )