Thanks Aaron. The evaluate context is incredibly useful...
Another interesting I've noted is that equality checking of expressions
(using == operator, not equals) seem to fail if one subexpression has
evaluate set to False whereas an identical expression has the same
subexpression set to True. Is this by design -- for more complicated core
types -- or a bug?
Here's some sample code to reproduce the issue:
>>> expr_eval_false = sympify('2*x-4', evaluate=False)
>>> expr_eval_false
2*x - 4
>>> expr_eval_true = sympify('2*x-4', evaluate=True)
>>> expr_eval_false == expr_eval_true
False
>>> expr_eval_false.equals(expr_eval_true)
True
I'm interested in comparing sympy expression trees so look forward to some
independent work in that area.
On Friday, October 7, 2016 at 4:17:14 PM UTC-4, Aaron Meurer wrote:
>
> You can use with evaluate(False):
>
> In [11]: with evaluate(False):
> ....: print(x - sin(x - x))
> ....:
> x - sin(-x + x)
>
> Aaron Meurer
>
> On Fri, Oct 7, 2016 at 3:29 PM, Robert Lee <[email protected]
> <javascript:>> wrote:
> > I want the ability to be able to recursively pass flags like
> evaluate=False
> > through all the sub-expressions. Is this currently possible? The best
> hack I
> > have is actually going through and reforming each sub-expression
> recursively
> > and setting the appropriate flags.
> >
> >
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