Comment #18 on issue 1587 by mattpap: Polynomials docs
http://code.google.com/p/sympy/issues/detail?id=1587
You've been doing a lot of work with the printers lately, so maybe you
know
how to fix it.
My hash-less key-function for sorting would do the job, but I'm not sure if
this will be usable before the release, because I won't have much time for
SymPy this week.
I've never even heard of this Basic.keep_sign
$ isympy
IPython console for SymPy 0.6.7-git (Python 2.6.6) (ground types: gmpy,
cache: off)
In [1]: (x - 1)*(x + 1)
Out[1]: -(1 + x)⋅(1 - x)
$ isympy
IPython console for SymPy 0.6.7-git (Python 2.6.6) (ground types: gmpy,
cache: off)
In [1]: Basic.keep_sign = True
In [2]: (x - 1)*(x + 1)
Out[2]: (1 + x)⋅(-1 + x)
If cache was enabled and you set Basic.keep_sign = True and you performed
some computations and want to set Basic.keep_sing = False (the default),
then SymPy won't recompute any of the cached expressions, so you will still
be getting results as keep_sign was set to True, although it's set to
False. So, I you want to change keep_sign value once again, you have to
clear cache to make this do what you intended (assuming cache wasn't
disabled from the beginning).
I use keep_sign in wester, because I can't stand this particularly annoying
SymPy's behaviour. We should make keep_sign = True the default in the next
release (I mean 0.7.1).
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