[FEniCS] deriving from user-defined expression

[Miroslav Kuchta]

Hi,

I have a question about deriving from user-defined expressions in Python.
Consider
class A(Expression):
   def eval(self, values, x):
       pass

class B(A):
   def eval(self, value, x):
       pass

Running the snippet produces ValueError when ExpressionMetaClass is trying
to remove Expression from bases of B. So it seems inheritance is not 
possible.
Are there some tricks to make the example work? Thanks.

Regards, Miro


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