在python中操作链表？

Question

我正在尝试编写代码来操作链表，这是我到目前为止所拥有的：

def main ():
    readFile('list1.txt')
    head1 = readFile('list1.txt') 
    profile1 = head1
    readFile('list2.txt')
    head2 = readFile('list2.txt')
    profile2 = head2
    choice(profile1, profile2)



def choice(profile1, profile2):
    print("  ")
    print("Welcome to your Netflix list!")
    print("  ")
    print("Type 'one' to view profile #1's custom list")
    print("Type 'two' to view profile #2's custom list")
    print("type 'merge' to merge the two profile lists")
    print("Type 'check' to delete duplicate values in your merged list")
    print("Type 'add' to add values to your (profile #1's) list")
    print("Type 'delete' to delete a value from your (profile #1's) list")
    print("  ")
    choice = input("Please input your choice: ").lower()
    if (choice == 'one'):
        display(profile1, profile1, profile2)
    elif (choice == 'two'):
        display(profile2, profile1, profile2)
    elif (choice == 'merge'):
        merge(profile1, profile2)
    elif(choice == 'check'):
        check(profile1, profile2)
    elif (choice == 'add'):
        add(profile1, profile2)
    elif(choice == 'delete'):
        delete(profile1)
    else:
        print("That input was not understood. Try typing that again")
        choice(profile1, profile2)

def add(profile1, profile2):
    insert = print(input("Type the name you would like to add: "))
    addToEnd(profile1, insert)
    choice(profile1, profile2)


def merge(profile1, profile2):
    head = profile1
    ptr = head
    while ptr != None:
        print(ptr['data'])
        ptr = ptr['next']
    choice = print(input("Input number before which to insert the list: "))
    ptr = head
    while ptr['next'] != choice:
        ptr = ptr['next']
    nodeAfter = ptr['next']
    profile2['next'] = nodeAfter
    ptr['next']= profile2
    head = profile1
    ptr = head
    while ptr != None:
        print(ptr['data'])
        ptr = ptr['next']


def display(profile, profile1, profile2):
    head = profile
    ptr = head
    while ptr != None:
        print(ptr['data'])
        ptr = ptr['next']
    choice(profile1, profile2)



def readFile (file):
    with open(file, 'r') as ins:
        profile = {}
        profile['data'] = ins.readline().strip()
        profile['next'] = None
        head = profile
        for line in ins:
            addToEnd(head, line)
        return profile   


def addToEnd (head, value):
    newEntry = {}
    newEntry['data'] = value.strip()
    newEntry['next'] = None
    ptr = head
    while ptr['next'] != None:
        ptr = ptr['next']
    ptr['next'] = newEntry
    return ptr


main()

显然应该做的事情比我说的要多，但是我无法超越这些。当我尝试使用'add'函数时，它会记住有一个链接，但它只是说'none'，所以输入的内容都会丢失。 同样在合并函数中，它没有这样做，我猜测是因为链接/值没有数字，所以它不知道在哪里插入或类似的东西。是否可以为链表中的值/链接赋予一​​个数字？我将头部传递给其他功能时也会遇到很多错误，因此一旦完成其他功能就可以返回菜单。我真的不知道出了什么问题，我觉得这可能是我缺少的链表的根本原因。

编辑：我意识到在python中使用链表是没有意义的。但这是我的功课，所以不幸的是，这是我必须做的。