> - remove the checks from Perm, and make a *function* PermS (the name is > deliberately chosen to be as close as Perm) that performs the checks and > then constructs a permutation object using Perm (the name comes from > Permutation Safe).
I am in favor of this. `Basic` subclasses should exist for mathematical concepts, not for user convenience (especially when we take the need for reconstruction of these classes and their expression trees into account). A helper function is a much better solution than some magic done in the `__new__` method. -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
