python对象序列化pickle

import pickle

class A:
    users = {}
    c = 1
    def get_self(self):
        return self
    def n(self):
        return 1

    def pick_str_to_obj(self):
        return 'xiaoming'
a = A()
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dumpss = pickle.dumps(a)
reversess = pickle.loads(dumpss)
----------------------------------------------
with open('aaad.txt', 'wb') as f:
    picklestring = pickle.dump(a, f)

with open('aaad.txt', 'rb') as f:
    obj = pickle.load(f)
print(obj.n())

ps：多个对象咋办？？

list， dict也是对象哟