python __iter__函数、__next__函数和__call__函数

class person:
    def __init__(self):
        self.l = []
        self.count = 0
        self.index = 0
    # def addNew(self, name, age):
    #     personReal = {'name':name, 'age':age}
    #     self.count = self.count + 1
    #     self.l.append(personReal)
    def __call__(self, name, age):
        personReal = {'name':name, 'age':age}
        self.count = self.count + 1
        self.l.append(personReal)
    def __getitem__(self):
        print("__getitem__")
    def next(self):
        print('next')
    def __next__(self):
        print('__next__')
        if self.index < self.count :
            self.index = self.index + 1
            return self.l[self.index]
    def __iter__(self):
        print('__iter__')
        if self.index < self.count:
            self.index = self.index + 1
            return iter(self.l)

if __name__ == '__main__':
    personS = person()
    # personS.addNew('john',8)
    # personS.addNew('jane', 7)
    # personS.addNew('Steve', 9)

    personS('john',8)
    personS('jane', 7)
    personS('Steve', 9)

    print(personS.count, personS.index, personS.l)

    for ps in personS:
        print(ps)
        print(len(ps))
        print(ps.keys)
        for key in ps.keys():
            print("key %s, ps[key] = %s" % (key, ps[key]))