#5967: ElementWrapper: A class for wrapping Sage or Python objects as Sage
elements
-------------------------+--------------------------------------------------
Reporter: nthiery | Owner: nthiery
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.0
Component: misc | Keywords:
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Comment(by mabshoff):
This is broken:
{{{
129 sage: cmp(l11, l12), cmp(l12, l11) # values
differ
130 (-1, 1)
131 sage: cmp(l11, l21), cmp(l21, l11) # parents
differ
132 (-1, 1)
}}}
'''Never''' check the return value of {{{cmp}}} to be -1 or 1, but always
write
{{{
sage: cmp(l11, l21) in [-1,1]
True
}}}
since the value depends on memory location. I have had to fix this
literally dozens of times in doctests.
Cheers,
Michael
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5967#comment:1>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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