Comment #107 on issue 1598 by asmeurer: New polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=1598
I can give an example:
factorint(192, visual=True)
6 1
2 ⋅3
factorint(192, visual=True) + 1
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "./sympy/core/decorators.py", line 106, in __sympifyit_wrapper
return func(a, b)
File "./sympy/core/basic.py", line 697, in __add__
return Add(self, other)
File "./sympy/core/cache.py", line 85, in wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "./sympy/core/operations.py", line 31, in __new__
c_part, nc_part, order_symbols = cls.flatten(map(_sympify, args))
File "./sympy/core/add.py", line 111, in flatten
noncommutative = noncommutative or not s.is_commutative
AttributeError: is_commutative
I noticed this when I implemented this feature in factorint. I was
wondering if Mateusz fixed this when I saw that
he was doing unevaluated 2*(x + y), but I guess he didn't.
Of course, fixing issue 1497 would be even better for doing this.
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