[Biopython-dev] Pickle problem on 64 bit Windows with Python 3.4

[Manlio Calvi]

>From what I read here http://hg.python.org/cpython/rev/4a6b8f86b081 could
be a problem related to that file. Seems to me they stripped the check for
a quote that must be in, and looking at the pickle apparently isn't

On Mon, Apr 21, 2014 at 7:12 PM, Peter Cock <p.j.a.cock at googlemail.com>
wrote:
> On Mon, Apr 21, 2014 at 6:00 PM, Manlio Calvi <manlio.calvi at gmail.com>
wrote:
>> I think we hit a stumbling block here, and maybe a serious one (but
>> we'll be sure with more tests), because this following error suggest
>> me the way we used the pickling in the code changed or something
>> strange happened in my config.
>> Apart from installing a 3.3, I'll try to go experimental with 3.4, I
>> want to understand if it is a problem with my build of 3.4 or if it is
>> a general issue of 3.4 with some piece of BioPython.
>>
>> C:\Users\Public\BioPython3\biopython\Tests\SubsMat>python -c "import
pickle; h =
>> open('acc_rep_mat.pik', 'rb'); m = pickle.load(h);h.close();print(m);
>>
>> Traceback (most recent call last):
>> File "<string>", line 1, in <module>
>> _pickle.UnpicklingError: the STRING opcode argument must be quoted
>>
>
> Good - I was hoping that would happen - we have a clear test
> case separate from the Biopython code now.
>
> The pickle file acc_rep_mat.pik was created long ago (15 Nov 2000)
> with Python 2, and I would have hoped it would be forward compatible.
> This could be a regression in Python 3.4 itself (under Windows 64 bit
> only)?
>
> If anyone else has a 64 bit Windows machine and Python 3.4,
> please try this and let us know what happens.
>
> Thanks,
>
> Peter