write() argument must be str, not LinkedList

January 24, 2022

I’m making a working phone book with linked list.
I am trying to save data in a txt file.
The write command only takes str into it.
How can I convert temp.data.name to str.I mean linked list object to str.
I got the same error when I typed str(temp.data.name) at the beginning too.

temp = linked_list.head
f = open("phonebook.txt", "w")
while temp:
    namestr = " ".join(temp.data.name)
    f.write(namestr)
    numberstr = " ".join(temp.data.number)
    f.write(numberstr)
    temp = temp.next

f.close()

>Solution :

Here is simple example to store phonebook in linked list and save it to file:

from __future__ import annotations

import dataclasses

@dataclasses.dataclass
class Record(object):
    name: str
    number: str

@dataclasses.dataclass
class Node(object):
    data: Record
    next: Node = None

head = Node(Record('Alice', '123'), Node(Record('Bob', '456')))

with open('phonebook.txt', 'w', encoding='utf-8') as f:
    temp = head
    while temp:
        f.write(f'{temp.data.name} - {temp.data.number}\n')
        temp = temp.next