I'm creating an instance of a Class like this :
def exists(username, password):
    try:
        user_doc =  User.objects(username=username,password=password).exclude('password')
    except DoesNotExist, e:
        raise e
    return user_doc._parse()
The try block raises this exception when there are no matching records.
 But I get syntax error. 
How should I catch this exception ?
 
    