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[Christian Clason <767050@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I suspect I found another swig problem: it is not possible in Python to derive a class from 
PETScUserPreconditioner. The code

from dolfin import *
class DiagonalPreconditioner(PETScUserPreconditioner) :
     def __init__(self) :
         PETScUserPreconditioner.__init__(self)

fails with

NameError: name 'PETScUserPreconditioner' is not defined

(The corresponding line in dolfin/swig/import/la.i is indeed missing, but I'm not sure if that 
is the whole problem.)

** Affects: dolfin
     Importance: Undecided
         Status: New


** Tags: petsc preconditioner python

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https://bugs.launchpad.net/bugs/767050

Title:
  PETScUserPreconditioner is not defined

Status in DOLFIN:
  New

Bug description:
  I suspect I found another swig problem: it is not possible in Python to derive a class from 
  PETScUserPreconditioner. The code

  from dolfin import *
  class DiagonalPreconditioner(PETScUserPreconditioner) :
       def __init__(self) :
           PETScUserPreconditioner.__init__(self)

  fails with

  NameError: name 'PETScUserPreconditioner' is not defined

  (The corresponding line in dolfin/swig/import/la.i is indeed missing, but I'm not sure if that 
  is the whole problem.)