1. Use concise character class syntax
2. Add a "break" statement or remove this "else" clause.
3. Replace this generic exception class with a more specific one.
4. Use a regular expression literal instead of the 'RegExp' constructor.
5. Use the opposite operator ("not in") instead.
1) Replace the deprecated unit test method.
2) Wraps filter usage in a list call.
3) Converts the old metaclass syntax to new.
4) Use range instead of xrange method.
5) Change Unicode to str.
6) Several other transformations.
7) Fixed change password test cases.
8) Use simplejson instead of plain JSON.
