Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Critical Printing Milestone-Release0.7.0
New issue 2425 by asmeurer: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
Ever since the commit
commit b8d6252ea115032f7da8c46aca60af0b6a75fd36
Author: Ronan Lamy
D
Updates:
Cc: smi...@gmail.com
Comment #1 on issue 2425 by asmeurer: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
It boils down to this. In line 618 of pretty.py, if term.as_coeff_mul()[0]
is negative, then the pretty printer expects (-term).as_coeff_mul()[0
Comment #2 on issue 2425 by asmeurer: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
By the way, making as_coeff_mul() satisfy that invariant
((-term).as_coeff_mul()[0] == -(term).as_coeff_mul()[0]) might be a good
idea, but the question is how difficult would it be
Comment #3 on issue 2425 by asmeurer: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
It boils down (again) to this behavior:
In [21]: a.args[0]
Out[21]: x - 5
In [22]: a.args[0].as_coeff_mul()
Out[22]: (-1, (-x + 5,))
Is this necessary? It leads to the kind of minus
Comment #4 on issue 2425 by matt...@gmail.com: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
It seems we will soon converge here to the discussion about as_coeff_{mul,
Mul} and why such low-level functions shouldn't do expensive (relatively)
and arbitrary symbolic
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
Updates:
Labels: NeedsReview asmeurer
Comment #6 on issue 2425 by asmeurer: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
It comes from (oo**(2 - x)).as_base_exp() returning (0, x - 2). This is
because it checks if the base is Rational and flips it if it is
Updates:
Status: Fixed
Comment #7 on issue 2425 by smi...@gmail.com: Pretty printing bug
http://code.google.com/p/sympy/issues/detail?id=2425
thanks, it's in.
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