> Paolo Pantaleo wrote: > >> I have a function >> >> def f(the_arg): >> ... >> >> and I want to state that the_arg must be only of a certain type >> (actually a list). Is there a way to do that? > > Yes and no. You can ensure that the passed object is a list, by calling e.g. > > def f(arg): > if not isinstance(arg, list): > raise "Not a list!" > > > Alternatively, you can just use it as an iterable - and the exception will > come from arg not being iterable. > > But what you can't do is make python complain about this: > > def f(arg): > for e in arg: > print e > > > f(100) > > before actually calling f. It will always fail at runtime. > > Diez
What about def f(arg): if type(arg)=='list': #do something -- --- Rony Steelandt BuCodi rony dot steelandt (at) bucodi dot com Visit the python blog at http://360.yahoo.com/bucodi -- http://mail.python.org/mailman/listinfo/python-list