Add (already followed) users to a Mastodon list using Mastodon.py

mastodon-import-list.py

#!/usr/bin/env python3

# Very quickly thrown together script to add (already followed) Mastodon users to a list.
# YMMV - it probably needs some tweaking to work for you
# relies on Mastodon.py and needs a "credentials.py" file with the variables access_token and api_base_url
# I created my access token following the docs at https://docs.joinmastodon.org/client/token/ and https://docs.joinmastodon.org/client/authorized/
# but you might be able to get the access token by going to Settings|Development|New Application (I haven't tried though).
# As there is a rate limit for usage of the API I wouldn't try to import lots of users at once - I imported 132 users and it worked though...
# @axwax@fosstodon.org

import signal
from urllib.request import urlopen
from mastodon import Mastodon
from credentials import access_token, api_base_url

# name of the text file to import
# one username in the format @user@instance per line
list_filename = "makers.txt"

# Initialise Mastodon.py
mastodon = Mastodon(
    access_token = str(access_token),
    api_base_url = str(api_base_url)
)

# grab all lists and print their IDs 
my_lists = mastodon.lists()
print (my_lists)

# let user enter a list's id
list_id = int(input ("please enter list id:"))
print(list_id)

# get all account ids that are currently in the list
the_list = mastodon.list_accounts(list_id)
account_ids_in_list = [user['id'] for user in the_list]

# remove the new line characters
not_added = []
not_found = []
account_ids_to_add = []

# open the text file and loop through each entry
with open(list_filename) as f:
    lines = [line.rstrip() for line in f]
    for line in lines:
        # for each entry search for the corresponding account, only searching for accounts you already follow
        account = mastodon.account_search(q=line, following = True)
        # if the account is found and not already in the list, add it to "account_ids_to_add", otherwise add it to "not_found" or "not_added" respectively
        if (len(account) == 1):
            account = account[0]
            print(account['acct'] + ", " + account['display_name'] + ", " + str(account['id']))
            if(account['id'] not in account_ids_in_list):
                account_ids_to_add.append(account['id'])
            else:
                not_added.append(account['id'])
        else:
            not_found.append(line)

# print out any possible errors / warnings          
if (len(not_found) > 0):
    print("error: the following accounts could not be found: ")
    print(*not_found,sep='\n')
if (len(not_added) > 0):
    print("warning: the following accounts were already in the list: ")
    print(*not_added,sep='\n')

# finally, try to add the accouts to the list
try:
    makers = mastodon.list_accounts_add(list_id, account_ids_to_add)
    print(makers)
except:
    print("error: can't add the following accounts: ")
    print(*account_ids_to_add,sep='\n')