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[Garth Wells <747273@xxxxxxxxxxxxxxxxxx>]

** Changed in: dolfin
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/747273

Title:
  Python: LA objects are deleted when Dolfin object goes out of scope

Status in DOLFIN:
  Fix Committed

Bug description:
  The following code:
  ------
  import PyTrilinos
  from dolfin import *
  parameters["linear_algebra_backend"] = "Epetra"

  mesh = UnitSquare(2,1)
  CG1 = FunctionSpace(mesh, "CG", 1)
  q, p = TestFunction(CG1), TrialFunction(CG1)
  A = assemble(q*p*dx)

  D = down_cast(A).mat()
  #del A
  print D
  ------
  fails when "del A" is uncommented. (with the petsc backend it always fails, but that's another problem).

  In cbc.block I work around this by creating a back-reference in the LA
  object to its container, but this should not be necessary given that
  shared_ptr is returned by mat().