[Debian-science-sagemath] Sage broken with Python 2.7.13~rc1-1

[Ximin Luo]

Ouch, nice catch. I actually did notice that a new version of python had been uploaded by running `debian/show-deps.sh by-date` but ignored it because "oh it can't possibly be a python bug". I guess it's worth paying attention to the output of that for the future.

X

Tobias Hansen:
> Actually it looks more related to https://bugs.python.org/issue24469
> 
> From the changelog:
> Issue #24469: Fixed memory leak caused by int subclasses without
> overridden tp_free (e.g. C-inherited Cython classes).
> 
> And our error happens at tp_free in sage/misc/classcall_metaclass.pyx
> 
> On 12/06/2016 05:32 PM, Tobias Hansen wrote:
>> Hi all,
>>
>> there was an update to python2.7 on Sunday that unfortunately broke
>> building or even running sage. The error one gets is this:
>>
>> TypeError: sage.misc.fast_methods.WithEqualityById.__new__(UnknownClass)
>> is not safe, use object.__new__()
>>
>> In the changelog it of python2.7 there is this entry:
>> Issue #5322: Fixed setting __new__ to a PyCFunction inside Python code.
>>
>> leading to this bug report:
>> https://bugs.python.org/issue5322
>>
>> I just found this, just wanted to let you know why nothing works.
>>

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