Many thanks Aaron !
What would be the best place to do a bug report ? Github ?
Vincent
On Tuesday, March 8, 2016 at 6:48:46 PM UTC-3, Aaron Meurer wrote:
>
> I think the evaluation of booleans happens in the superclass
> (LatticeOp), which ignores the evaluate flag. It should probably be
> considered a bug. A simple workaround would be to use Symbol("true")
> and Symbol("false") instead of S.true and S.false (and replace them
> with their true boolean counterparts when you wish to evaluate them).
>
> Aaron Meurer
>
> On Tue, Mar 8, 2016 at 3:49 PM, Vincent Noel
> <vincen...@butantan.gov.br <javascript:>> wrote:
> > Hi !
> >
> > I'm working on a project where I need to save expressions unevaluated.
> So
> > far so good, but I'm having a problem with boolean operators.
> > Here is an example of expression (coming from test units, thus the
> apparent
> > weirdness) :
> >
> > True && False
> >
> > which I'm writing in Sympy as :
> >
> > sympy.And(sympy.true, sympy.false, evaluate=False)
> >
> > Problem is that, contrary to other sympy operators/functions, the
> > evaluate=False seems to have no effect. This always evaluate the
> expression
> > Is there any other way to prevent that ? Am I doing something wrong ?
> >
> > Many thanks for what is already an awesome library :)
> >
> > Vincent
> >
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