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())