Here is an example why `__eq__` should correspond to structural equality: >>> class a(object): ... def __eq__(self, other): ... raise NotImplementedError() ...
>>> i = a() >>> list = [1,2,3,i] >>> list.index(i) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in __eq__ NotImplementedError __eq__ is part of basic python protocols, we should not make it do other things. -- 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. 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/CAD8szLxfMiWvhFxkELqSwFdJTauce8jr0%3DHz-AmiCA3UnGs%2BSw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
