Pickle problem while loading a class instance.

gerardob gberbeglia at gmail.com
Tue Apr 6 19:23:56 CEST 2010


Hello, I am new to python and i have a problem using the pickle load
function.
I have an object m of the class MarkovModel and i want to copy it to a file
and load it onto another class:

l=[1,2,3]
m = markov_model.MarkovModel()
m.load_observations(l)
file = open("prueba.txt", 'w')
pickle.dump(m,file,2)
file.close()

#m2 = markov_model.MarkovModel()

file = open("prueba.txt", 'rb')
m2 = pickle.load(file) (THIS IS LINE 36)

The error below appears. In the case i remove the comment to initialize m2,
the same thing happens. Any ideas on how to fix this?

Thanks.

Traceback (most recent call last):
File "C:\Users\gberbeglia\Documents\python\scripting\mycodes\main.py", line
36, in <module>
m2 = pickle.load(file)
File "C:\Python26\lib\pickle.py", line 1370, in load
return Unpickler(file).load()
File "C:\Python26\lib\pickle.py", line 858, in load
dispatch[key](self)
File "C:\Python26\lib\pickle.py", line 1090, in load_global
klass = self.find_class(module, name)
File "C:\Python26\lib\pickle.py", line 1124, in find_class
__import__(module)
ImportError: No module named markov_model
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