It's always recommended to keep properties such as username, password, .. etc in .cfg files, instead of code. (Debate of appropriate/correct approach is out of context :) )
Let's say we have application configurations in a file "app.cfg". Contents of the "app.cfg" file:
[default]
host=abc.xyz.com
...
...
[mysql]
username=root
password=root
...
Let's look at the python code snippet to read the above application properties.
import ConfigParser
# class definition
class <class_name>:
def __init__(self):
##### read properties
config = ConfigParser.RawConfigParser()
config.read(self.__file_path('app.cfg'))
user = config.get('mysql', 'user')
password = config.get('mysql', 'password')
# some other code funtionality
....
