jwaixs wrote: > > Diez B. Roggisch wrote: >> Why do you wrap a in a list? Just >> >> c = a + [b] >> >> will do it. > > Yes I know, but the problem is I don't know if 'a' is a list or not. I > could make a type check, but I don't want to program in that way.
Somewhere in the call chain you have made the decision "I want this function to accept both lists and scalars", but always passing in lists is probably the better approach. If you want to go with your original idea -- googling in c.l.py will turn up many more or less optimized variants of flatten() that basically follow the same approach as yours. There is also Tkinter._flatten() which you can use though it gives you a tuple, not a list -- the place at least should meet the "obscurity" criterion :-) Peter -- http://mail.python.org/mailman/listinfo/python-list
