It looks like a bug with the evaluate=False logic. The issue isn't
with parse_expr(). You get the same error running
with evaluate(False):
Union(Interval(-oo,0),Interval(-3,oo))
although I should mention that parse_expr(evaluate=False) ought to
work, but it doesn't. Can you open an issue for this?
Aaron Meurer
On Fri, Oct 14, 2022 at 8:40 AM Casey S. Schroeder <[email protected]> wrote:
>
> Hello Sympy,
>
> It appears there is a bug with the parse_expr running under evaluate(0)
>
> mathystuff = "Union(Interval(-oo,0),Interval(-3,oo))"
> with evaluate(0):
> frmla0 = parser.parse_expr(mathystuff, local_dict,
> transformations=transformations)
>
> the error I am getting appears to be 'cannot determine truthvalue of
> Relational', which seems to me to mean it does not know how to arrange the
> terms with -oo without reducing it... It also fails if I replace oo with 30.
> But not if I replace -oo with -30. Hence the issue appears to be with -oo
>
> I am on 1.10.1 so if I need to update let me know, but it was a recent conda
> install.
>
> Thanks,
>
> Casey
>
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