尝试腌制对象实例会引发腌制错误

Question

I am trying to pickle class instance, referring to http://stefaanlippens.net/python-pickling-and-dealing-with-attributeerror-module-object-has-no-attribute-thing.html However gives me

try.py

import pickle

class abc(object):
      def __init__(self):
         self.a = 10
      def save(self):
         pickle.dump(self,open("try.pkl","wb"))
if __name__ == '__main__':
      a = abc()
      abc.__module__ = "try"
      a.save()

pickle.PicklingError: Can't pickle <class 'try.abc'>: it's not the same object as try.abc

Am I making a mistake here ? Is there a different solution to pickle object for stand alone purpose

Answer 1

If you take away your abc.__module__ = "try" everything works fine.

import pickle

class abc(object):
      def __init__(self):
         self.a = 10
      def save(self):
         pickle.dump(self,open("try.pkl","wb"))
if __name__ == '__main__':
      a = abc()
      a.save()

      # proof it worked
      with open('try.pkl','rb') as pkl_file:
          b = pickle.load(pkl_file)
      print(b.a)

I've added code at the end to reload the data and print it to show it was successful.