Updates:
Status: Started
Comment #5 on issue 2425 by asmeurer: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
Amazingly, if you remove Add.as_coeff_mul() (so that it always just returns
(S.One, self)), there is only one test failure other than a test testing
the old behavior:
________________ sympy/core/tests/test_eval_power.py:test_zero
_________________
File "/users/aaronmeurer/documents/python/sympy/sympy/sympy/core/tests/test_eval_power.py",
line 159, in test_zero
assert 0**(x - 2) == S.Infinity**(2 - x)
AssertionError
This is because the one is no longer transformed into the other, which is a
good thing in my opinion (again, no more automatic sign manipulation).
Unfortunately, this uncovers another pretty printing bug:
In [10]: print (S.Infinity**(2 - x))
(oo)**(-x + 2)
In [11]: (S.Infinity**(2 - x)).args
Out[11]: (∞, -x + 2)
In [12]: (S.Infinity**(2 - x))
Out[12]:
x - 2
0
If I can figure out how to fix that (and if I don't find any other bugs),
then a patch will be forthcoming soon.
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