map document in walkable way...

[Shagshag13]

I have document which contain lines :

type 2
type 1
type 1
type 2
etc.

I would like to create some kind of class that i could use to map my
document and use it in a walkable way :

d = document(file)
for l in d:
    if l.is_type1():
        do_something
    elif l.is_type2():
        do_something_else

document if something like a container...

but don't know how to do that in a pythoner's way...

thank in advance to those who help...

s13.