xml to container (PYTHON)

[Blackbug]

i am reading an xml file and need to store the contents (elements) of that to a container.

mapping = {}
titleTuple =[]
i=0
for node in doc.getElementsByTagName("book"):
isbn = node.getAttribute("isbn")
L = node.getElementsByTagName("title")
for node2 in L:
title = ""
print title
for node3 in node2.childNodes:
if node3.nodeType == Node.TEXT_NODE:
title += node3.data
print "title %s,node3.data %s"%(title,node3.data)
titleTuple.append[node3.data]
mapping[isbn] = title

I am confused which container to be used and how.
I tried set "titleTuple.append[node3.data]" but it gives an error
'builtin_function_or_method' object is unsubscriptable

i am new to python so kindly help me on this.

[surfer]

titleTuple.append(node3.data)

round brackets for functions.