Hi,

Currently, demo.py in trilinos/python has the following code:
try:
    # import Trilinos stuff
    from PyTrilinos import Epetra, AztecOO, TriUtils, ML
    trilinos_installed = True

If trilinos is installed, but dolfin is built without trilinos, the demo 
will fail:

./../../demo/la/trilinos/python (Python)

Traceback (most recent call last):
  File "./demo.py", line 61, in <module>
    backend = EpetraFactory.instance()
NameError: name 'EpetraFactory' is not defined

I suggest we use the following try, which follows the tests from 
eigensolver/python:

try:
    dolfin.EpetraMatrix

ilmar



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