import pickle
class Student:
  def __init__(self, name, age):
    self.name = name
    self.age = age
  def say(self):
    print("I am", self.name)
> t = Student('Tom', 23)
> t.say()
I am Tom
>
> save_path = './tom_msg'
> with open(save_path, 'wb') as f:    # 字节流写入
...   pickle.dump(t, f)      # 序列化数据保存在文件中
>
> with open(save_path, 'rb') as f:    # 字节流读出
...   after_t = pickle.load(f)    # 读取文件信息反序列化成对象
...
> after_t.__dict__
{'name': 'Tom', 'age': 23}
> after_t.say()
I am Tom
>
>
> l = Student('Lisa', 23)
> serialized = pickle.dumps(l)
> serialized
b'\x80\x03c__main__\nStudent\nq\x00)\x81q\x01}q\x02(X\x04\x00\x00\x00nameq\x03X\x04\x00\x00\x00Lisaq\x04X\x03\x00\x00\x00ageq\x05K\x17ub.'
> after_l = pickle.loads(serialized)
> after_l.say()
I am Lisa
> after_l.__dict__
{'name': 'Lisa', 'age': 23