Error using ElementTree to parse data from .config file - python-2.7

Question

Im trying to use ElementTree to get data from a .config file. The structure of this file is like this for example:
<userSettings>
<AutotaskUpdateTicketEstimatedHours.My.MySettings>
<setting name="Username" serializeAs="String">
<value>AAA</value>
</setting>
My code is this:
import os, sys
import xml.etree.ElementTree as ET
class Init():
script_dir = os.path.dirname(__file__)
rel_path = "app.config"
abs_file_path = os.path.join(script_dir, rel_path)
tree = ET.parse(abs_file_path)
root = tree.getroot()
sites = root.iter('userSettings')
for site in sites:
apps = site.findall('AutotaskUpdateTicketEstimatedHours.My.MySettings')
for app in apps:
print(''.join([site.get('Username'), app.get('value')]))
if __name__ == '__main__':
handler = Init()
However, when I run this code I get:
Traceback (most recent call last):
File "/Users/AAAA/Documents/Aptana/AutotaskUpdateTicketEstimatedHours/Main.py", line 5, in <module>
class Init():
File "/Users/AAA/Documents/Aptana/AutotaskUpdateTicketEstimatedHours/Main.py", line 16, in Init
print(''.join([site.get('Username'), app.get('value')]))
TypeError: sequence item 0: expected string, NoneType found
What I'm I doing wrong the causes this error?
(My problem seems to be accessing the tree structure of my config.file correctly)

Answer 1

You may change your code to:
print(''.join([app.get('name'), app.find('value').text]))
app is an Element Object in this case <setting>. Using the get function you will get an attribute value by name (e.g. name, serializeAs), using the find
function you will get a subelement (e.g <value>).
Once you have <value> you can get the data inside with text
Note that site (<AutotaskUpdateTicketEstimatedHours.My.MySettings>) doesn't have any attributes, therefore you get None.