Comment #20 on issue 2848 by pr...@goodok.ru: Failing test in
sympy/solvers/test/test_solvers.py
http://code.google.com/p/sympy/issues/detail?id=2848
Yes, this passes in the above patch.
But patch only cut off problem and therefore hide possible bug in the
complicated algorithm of auto calculation of assumptions (it based on rules
system, so is_positive calculation if is not defined try to calculate
through others known assumptions facts):
a)
from sympy.core.cache import clear_cache
clear_cache()
(I*pi).is_positive
False # in both branches
But
b)
clear_cache()
(I*pi).is_irrational
False # True in master branch
Then after cached of is_irrational all other behaviour id changed:
c)
clear_cache()
(I*pi).is_irrational
False # but True in master branch
(I*pi).is_positive
False # but True in master branch
Compare a) and c)
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