The following input:
from sympy import Symbol
QQ(1)+Symbol('x')*QQ(2)
produces an error:
TypeError Traceback (most recent call
last)
/Applications/sage/<ipython console> in <module>()
/Applications/sage/element.pyx in
sage.structure.element.ModuleElement.__add__ (sage/structure/element.c:
5606)()
/Applications/sage/coerce.pyx in
sage.structure.coerce.CoercionModel_cache_maps.bin_op (sage/structure/
coerce.c:6288)()
TypeError: unsupported operand parent(s) for '+': 'Rational Field' and
'<class 'sympy.core.mul.Mul'>'
If the operands are reversed for either '+' or '*', i.e.:
Symbol('x')*QQ(2)+QQ(1)
or
QQ(1)+QQ(2)*Symbol('x')
the statement executes correctly.
That's the bug; if anyone knows of a workaround for now I'd like to
hear it. My code builds up complicated expressions involving
rationals and symbols, and no matter how I reorder things, one of them
fails in this manner. I know I can use 'var' instead of 'Symbol', but
I need non-commutative symbolic multiplication, which as I understand
var does not support.
David
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