pickle class object in python/grasshopper

Replies to This Discussion

Permalink Reply by 筑梦NARUTO on March 16, 2015 at 10:13pm

Hi raf2205

 You should call the instance attributes

Permalink Reply by raf2205 on March 17, 2015 at 9:09am

hi 筑梦NARUTO and thanks for your answer. ok about instance attributes but then how to pickle a class object ?

Permalink Reply by raf2205 on March 17, 2015 at 8:53pm

cPickle is supposed to serialize class however I still get an exception line8 when pickle.dump

any idea?

import cPickle as pickle

class DoSomething:
    def __init__(self, data):
        self.data = data

#dump

test = DoSomething('hello')
output = open('D:\pklTest01.pkl', 'wb')
pickle.dump(test, output)
output.close()

#load

input = open("D:\pklTest01.pkl", "rb")
a = pickle.load(input)
print a.data

Permalink Reply by 筑梦NARUTO on March 17, 2015 at 10:59pm

HI Rad2205

You should study the python class，http://www.plethora-project.com/2011/09/12/rhino-python-tutorials/，You pickle.dump (test, output) to pickle.dump (test.date, output) can run

Permalink Reply by raf2205 on March 17, 2015 at 11:15pm

thanks. Yes it should run,  but it doesn't in grasshopper and I don't understand why. Actually the code is working good outside grasshopper, in eclipse for exaample, but I still get an exception in gh.

Does the last piece of code I posted returns you an exception?

Appreciate your help ;)

Permalink Reply by 筑梦NARUTO on March 18, 2015 at 12:16am

You can upload a file？

Permalink Reply by raf2205 on March 18, 2015 at 9:57am

here it is..

Attachments:

• pickle.gh, 3 KB

Permalink Reply by 筑梦NARUTO on March 18, 2015 at 10:17am

Hi raf2205

You see the eighth row，test.date

Permalink Reply by raf2205 on March 18, 2015 at 7:06pm

well,.. I think you didn't understand the issue.

I don't want to dump attributes. I want to dump the class object, which usually works..  https://docs.python.org/2/library/pickle.html

import cPickle as pickle

class DoSomething:
    def __init__(self, talk, eat, drink):
        self.talk = talk

        self.eat = eat

        self.drink = drink

#dump

test = DoSomething('hello','pasta','nama biru')
output = open('D:\pklTest01.pkl', 'wb')
pickle.dump(test, output)
output.close()

#load

input = open("D:\pklTest01.pkl", "rb")
a = pickle.load(input)
print (a.talk)

print (a.eat)

print (a.drink)

>>>'hello'

>>>'pasta'

>>>'nama biru'

Permalink Reply by raf2205 on March 21, 2015 at 3:12am

Any super python expert who could help on this ? :)