Hey all,
I think I have come across a possible Cython bug, but I am not sure. I
am using 8.1beta0. Here is as small of a working example as I can currently
get.
sage: %%cython
....: def foo(F, int i):
....: return F[i]
....: def foo2(F, int i):
....: return F._dictionary[i]
....:
sage: F = Family({-1:0})
sage: foo2(F, int(-1)) # This works
0
sage: foo(F, int(-1))
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
<ipython-input-40-24a8cb5ebbd7> in <module>()
----> 1 foo(F, int(-Integer(1)))
/home/travis/.sage/temp/apricot/12631/spyx/
_home_travis__sage_temp_apricot_12631_tmp_VdWmJ3_spyx/
_home_travis__sage_temp_apricot_12631_tmp_VdWmJ3_spyx_0.pyx in
_home_travis__sage_temp_apricot_12631_tmp_VdWmJ3_spyx_0.foo()
1 def foo(F, int i):
----> 2 return F[i]
3 def foo2(F, int i):
4 return F._dictionary[i]
/home/travis/sage-build/local/lib/python2.7/site-packages/sage/sets/family.pyc
in __getitem__(self, i)
723 'a'
724 """
--> 725 return self._dictionary[i]
726
727 # For the pickle and copy modules
KeyError: 0
sage: F._dictionary
{-1: 0}
sage: foo(F, int(2)) # Expected failure, but the input matches
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
...
KeyError: 2
It seems to have to do with a __getitem__. I do not understand what
precisely the situation is that makes this fail; when I try to go to
smaller examples, it works.
sage: class Bar(SageObject):
....: def __init__(self):
....: self._dictionary = {-1:0}
....: def __getitem__(self, x):
....: print(x)
....: return self._dictionary[x]
sage: foo(Bar(), int(-1))
-1
0
Any thoughts on this?
Best,
Travis
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