By the way this works:
In [9]: c = Blah(Symbol('a'))In [10]: (2*c).diff(c) Out[10]: 2 So, the question is why does `diff` care about the content of the free variable (i.e. the args)? Seems very bizarre. -- 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.
