Hi Petsc users, I would like to know how the following code must be modified in order to work with the latest versions of Petsc4py. http://code.google.com/p/petsc4py/issues/attachmentText?id=11&aid=4044638157340430804&name=SNES_MatShell.py&token=e664eb9a46d94c453334a46c924d3e93 Thank you for your help, Bests