double_linked_list in Python

class Frob(object):    def __init__(self, name):        self.name = name        self.before = None        self.after = None    def setBefore(self, before):        # example: a.setBefore(b) sets b before a        self.before = before    def setAfter(self, after):        # example: a.setAfter(b) sets b after a        self.after = after    def getBefore(self):        return self.before    def getAfter(self):        return self.after    def myName(self):        return self.namedef insert(atMe, newFrob):    """    atMe: a Frob that is part of a doubly linked list    newFrob:  a Frob with no links     This procedure appropriately inserts newFrob into the linked list that atMe is a part of.        """    atMe_temp = atMe    if newFrob.name < atMe.name:        while True:            new = atMe.before            if new == None:                break            if new.name < newFrob.name:                break            atMe = atMe.before        if new  == None:                        newFrob.after = atMe            atMe.before = newFrob        else:            temp = new.after            new.after = newFrob            newFrob.before = new            newFrob.after = temp            temp.before = newFrob    else:        while True:            new = atMe.after            if new == None:                break            if new.name > newFrob.name:                break            atMe = atMe.after        if new  == None:            atMe.after = newFrob            newFrob.before = atMe        else:            temp = new.before            temp.after = newFrob            newFrob.before = temp            new.before = newFrob            newFrob.after = new                        eric = Frob('eric')andrew = Frob('andrew')ruth = Frob('ruth')fred = Frob('fred')martha = Frob('martha')insert(eric, andrew)insert(eric, ruth)insert(eric, fred)insert(ruth, martha)print andrew.after.nameprint eric.before.name,eric.after.nameprint fred.before.name,fred.after.nameprint martha.before.name,martha.after.nameprint ruth.before.namedef findFront(start):    """    start: a Frob that is part of a doubly linked list    returns: the Frob at the beginning of the linked list     """    # Your Code Here    if start.before == None:        return start    else:        return findFront(start.before)print findFront(martha).nameprint findFront(fred).name