## Codigo

class Config(webapp.RequestHandler):
  def get(self):
    session = Session()
    logged = session.checkLogin('self')

class Session():
  def checkLogin(app):
    print app

## Saida:

Traceback (most recent call last):
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/__init__.py", line 499, in __call__
    handler.get(*groups)
  File "/Users/marcogomes/Sites/lab/adbird/main.py", line 40, in get
    logged = session.checkLogin('self')
TypeError: checkLogin() takes exactly 1 argument (2 given)