[DB-SIG] Why can't I append to a list object?

[Wayne]

Hello,
I have some code that I can figure out why it dosen't work. The piece of
code is this -
.
.
.
queryResults = db.query(mySelection)

rptData = queryResults.dictresult()

rptData.append = ({'EOF':'EOF'})     <--- this is the statement I get my
error.

The error I get is:
rptData.append = ({'EOF':'EOF'})
TypeError: object has read-only attributes

From what I read I thought one could append onto a list.

A side question-
 What I'm trying to do is reconize when  I read all the data from the
list. I use 'for' loop
  but have found nothing in the material I read that would indicate how
to determine
  the end of the list.

TIA.
Wayne