'Befriends the user specified by the user_id or screen_name.
Args:
user_id:
A user_id to follow [Optional]
screen_name:
A screen_name to follow [Optional]
follow:
Set to False to disable notifications for the target user
Returns:
A twitter.User instance representing the befriended user.'

def CreateFriendship(self, user_id=None, screen_name=None, follow=True):

    return self._AddOrEditFriendship(user_id=user_id, screen_name=screen_name, follow=follow)
