学习笔记，单例

class test(object):
    flog = None
    flog1 = False

    def __new__(cls, *args, **kwargs):
        if cls.flog is None:
            cls.flog = super().__new__(cls)
        return cls.flog

    def __init__(self):
        if not test.flog1:
            print("初始化")
            test.flog1 = True


abc = test()
bcd = test()
print(abc)
print(bcd)