no; I'll change that.


On Sat, Dec 14, 2013 at 5:26 AM, Sergey B Kirpichev <
notifications@github.com> wrote:

> In sympy/core/function.py:
>
> > @@ -181,7 +215,7 @@ def func(self):
> >
> >      def _eval_subs(self, old, new):
> >          if (old.is_Function and new.is_Function and old == self.func and
> > -            (not new.nargs or len(self.args) in new.nargs)):
> > +            (new.nargs is None or len(self.args) in new.nargs)):
>
> Can new.nargs be None?
>
> —
> Reply to this email directly or view it on GitHub<https://github.com/skirpichev/sympy/pull/3/files#r8351364>
> .
>