List Manipulation

[Roman]

I am getting

TypeError: unsubscriptable object

when specifying

for line in reader[:7]:


Steven D'Aprano wrote:
> On Tue, 04 Jul 2006 07:01:55 -0700, Roman wrote:
>
> > I would appreciate it if somebody could tell me where I went wrong in
> > the following snipet:
> >
> > When I run I get no result
>
> What do you mean? Does it print None?
>
> > cnt = 0
> > p=[]
> > reader = csv.reader(file("f:\webserver\inp.txt"), dialect="excel",
> >                          quotechar="'", delimiter='\t')
> > for line in reader:
> >     if cnt > 6:
> >        break
>
> That's a very unPythonic way of doing the job. The usual way of doing
> this would be something like this:
>
> for line in reader[:7]:
>     # no need for the "if cnt > 6: break" clause now
>
>
> >     for col in line:
> >        p[:0].append(str(col))
>
> p[:0] creates a new list, which has a string appended to it, and is then
> thrown away. What are you trying to do?
>
> If you are trying to insert the new entry at the beginning of the list,
> you probably want this:
> 
> p.insert(0, str(col))