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["Garth N. Wells" <gnw20@xxxxxxxxx>]

I'd like to create a sub-class of Expression,

  class my_expression(Expression):
      def __init__(self, V, x):
          self.x =x
          Expression.__init__(V = V)

but I'm having trouble with the constructor - I get the below error. Any 
tips?

Garth


line 120, in __init__
    raise TypeError, "Expression need to be initialized using either a 
'cpp.FunctionSpace', using kwarg 'V', or an 'ufl.FiniteElement' using 
kwarg 'element'."
TypeError: Expression need to be initialized using either a 
'cpp.FunctionSpace', using kwarg 'V', or an 'ufl.FiniteElement' using 
kwarg 'element'.