May I suggest to pick up a collection of quantum mechanics problems, and try to solve them using SymPy. I think this is the best way to get a list of missing features.
By the way, you can also take the code you write to solve specific problems in order to later create a tutorial. -- 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. For more options, visit https://groups.google.com/groups/opt_out.