I think it's a problem with the printer: In [1]: a = Add(3, 2, evaluate=False)
In [2]: a.args Out[2]: (3, 2) In [3]: a Out[3]: 2 + 3 The args are created in the correct order, it's the printer that apparently reorders the values. The structural equality is False because (2, 3) is not the same as (3, 2), and that sounds correct. Use Eq( , ) for mathematical equalities. On Wednesday, April 30, 2014 8:53:50 AM UTC+2, Duane Nykamp wrote: > > I really like how unevaluated operators are working. However, one > confusing aspect is that, on display, the operands are reordered to some > standard order, but on comparison, the operator order matters. > > n [3]: Add(3,2,evaluate=False) > Out[3]: 2 + 3 > > In [4]: Add(2,3,evaluate=False) > Out[4]: 2 + 3 > > In [5]: Add(3,2,evaluate=False) == Add(2,3,evaluate=False) > Out[5]: False > > > Is it possible to make the comparison use the same scheme as the display? > It is confusing to get results that 2+3 is not the same as 2+3. > > Duane > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/5b68d3eb-3432-4b53-8288-2a892dba49b5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
