Hi there, This is more an exercise to myself to understand python3. I took a code I wrote (acpype) and I am trying to make it compatible with either python 3 or 2.
I am trying to make a pickle file compatible with either python 3 and 2 as I believe it should be possible. I've looked at http://docs.python.org/py3k/library/pickle.html but still, when I create a pickle file for an object with python 2.7 and then I try to load it in python3, I got this: Python 3.1.2 (r312:79147, Jul 7 2010, 10:55:24) [GCC 4.2.1 (Apple Inc. build 5659)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from acpype import * # this acpype package contains needed class ACTopol >>> import pickle >>> o = pickle.load(open('AAA.acpype/AAA.pkl','rb')) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/sw/lib/python3.1/pickle.py", line 1365, in load encoding=encoding, errors=errors).load() TypeError: ('__init__() takes at least 2 positional arguments (1 given)', <class 'acpype.ACTopol'>, ()) >>> Now trying the contrary, pickle file is created with python3, I got this when trying to load it with python 2.7: Python 2.7 (r27:82500, Jul 7 2010, 10:48:15) [GCC 4.2.1 (Apple Inc. build 5659)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from acpype import * >>> import pickle >>> o = pickle.load(open('AAA.pkl','rb')) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/sw/lib/python2.7/pickle.py", line 1378, in load return Unpickler(file).load() File "/sw/lib/python2.7/pickle.py", line 858, in load dispatch[key](self) File "/sw/lib/python2.7/pickle.py", line 1083, in load_newobj obj = cls.__new__(cls, *args) AttributeError: class ACTopol has no attribute '__new__' Apart that, everything else seems to work. Just one note more: when loading the pickle file 2.7 in python 2.7, type(o) is <type 'instance'>, while pickle 3 in python 3, type(o) is <class 'acpype.ACTopol'> Many thanks in advance, Alan -- Alan Wilter S. da Silva, D.Sc. - CCPN Research Associate Department of Biochemistry, University of Cambridge. 80 Tennis Court Road, Cambridge CB2 1GA, UK. >>http://www.bio.cam.ac.uk/~awd28<<
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