# 玩with语句class TestWith(object):    def __init__(self):        print("this is init of TestWith")    def if_exist(self):        print("I'm here")    def __enter__(self):        print("This is TestWith __enter__")        return self    def __exit__(self, *args):        for i in args:            print(i)        print("Now __exit__")with TestWith() as t:    t.if_exist()