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From: Paulo da Silva <p_s_d_a_s_i_l_v_a_ns@netcabo.pt>
Newsgroups: comp.lang.python
Subject: Re: A pickle problem!
Date: Fri, 22 Apr 2016 02:52:27 +0100
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Às 22:43 de 21-04-2016, Paulo da Silva escreveu:
> Hi.
> 
> Why in this code fragment self.__name is not kept between pickle
> dumps/loads? How to fix it?
> 
> Thanks.
> 
> import pickle
> import pandas as pd
> import numpy as np
> 
> class C(pd.DataFrame):
> 	def __init__(self,name,*a,**b):
> 		super(C,self).__init__(*a,**b)
> 		self.__name=name
> 
> 	def GetName(self):
> 		return self.__name
> 
# Adding this works but looks tricky!

	def __getstate__(self):
		dfstate=super(C,self).__getstate__()
		cstate=(dfstate,self.__name)
		return cstate

	def __setstate__(self,cstate):
		super(C,self).__setstate__(cstate[0])
		self.__name=cstate[1]

> 
> dates = pd.date_range('20130101', periods=6)
> c = C("FOO",np.random.randn(6,4), index=dates, columns=list('ABCD'))
> 
> cd=pickle.dumps(c,pickle.HIGHEST_PROTOCOL)
> 
> d=pickle.loads(cd)
> 
> d.GetName()
> 
> # AttributeError: 'C' object has no attribute '_C__name'
>