[Maya-Python] Creating a Tree hierarchy using PyQt

[likage]

Hi all,

I have a list of node's full dag path as follows:
|Base|character|Mike|body
|Base|character|John
|Base|camera


I am trying to populate them in a Tree View hierarchy using PyQt based on
the above queried paths so that the tree view will be something as follow:
|-- Base
|--|-- character
|--|--|-- Mike
|--|--|--|-- body
|--|--|-- John
|--|-- camera

but instead in my UI, I got:
|Base
|Base|character
|Base|character|Mike
|Base|character|Mike|body
|Base
|Base|character
|Base|character|John
|Base
|Base|camera

where some of the hierarchy are created twice and they are populated as a
value in each row instead of the 'small arrow' sign where you can expand
them to view the next hierarchy.

This is my code:
class MyModel(QtGui.QStandardItemModel):
def __init__(self, parent=None):
super(MyModel, self).__init__(parent)
self.get_contents()

def get_contents(self):
self.clear()
#contents=
predicate_helpers.get_expanded_objects_of_behaviour("rig")
contents = [
'|Base|character|Mike|body',
'|Base|character|John',
'|Base|camera'
]

for content in contents:
count = content.count('|')
for index in range(count):
index = index + 2
split_path = '|'.join(content.split('|')[0:index])
self.add_item(split_path)

def add_item(self,name):
item1 = QtGui.QStandardItem(name)
self.appendRow([item1])

Can anyone kindly provide me any insights?