"Turhan Ozen" <txo at cs.nott.ac.uk> wrote in message news:3EBA50CB.2040306 at cs.nott.ac.uk... > in c it is possible to define > > #define PH x[1] > > so PH = 3 means x[1]=3 > > how can I do this in python? No. Python does not have a preprocessor. I'm not at all sure I'd want to do what you seem to want anyway: it seems that it is unnecessarily obscure. John Roth >