How about adding a check for a _sympify_ attribute in the sympify routine. It will permit 3rd party classes usage in sympy. At the moment if someone want something nontrivial, he needs to add it to sympify. But this is not pythonic. In python just having the same interface should be enough.
It will be useful for the gsoc projects implementing new classes. It will be also a good training for the future move to classes that know how to combine with others in Add and Mul. It will also remove the need for that static global dictionary `convert` which seems awfully ugly to me. -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
