Updates:
Cc: matt...@gmail.com
Comment #6 on issue 2674 by vlada.pe...@gmail.com: Remove the cmp_to_key()
helper function
http://code.google.com/p/sympy/issues/detail?id=2674
Hmmm. Mateusz did some recent work related to this so I have to redo my
branch from scratch (not yet ready). Still, looking at his patch aa94e72
(deprecate Basic.compare_pretty()) it occurs to me that we cannot remove
cmp_to_key as long as we have to support old ordering -- I'm not sure we
can guarantee the ordering is "old" if I change the function with whatever,
and we can't have Python 3 support with the cmp_to_key function. So, my
question is: Could we simply not define the old ordering for Python 3 and
be done with it? The reasoning being, as the old ordering was already "old"
by the time we got Python 3 support, then everyone on Python 3 should be
using the "new" ordering anyway. Thoughts?
Of course, maybe I'm just missing some obvious fix for this? I could just
replace the relevant line with default_sort_key, but obviously that's
not "old" ordering anymore. Mateusz, what do you think?
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