userlistV2.py

#Requirements to run: Python, xlwt, telethon. to install these dependencies, run
# pip install xlwt
# pip install telethon
import xlwt
from telethon import TelegramClient, sync

#api_id and api_hash from https://my.telegram.org/apps, create a program to use.
# If the code is not modified to have one built in, it will instead prompt the user at runtime.
api_id = 'YOUR_TOKEN_ID_HERE'
if (api_id is 'YOUR_TOKEN_ID_HERE'):
    print("you did not set an api_id in the script.")
    api_id = input('Please input api_id: ')

api_hash = 'YOUR_HASH_ID_HERE'
if(api_hash is 'YOUR_HASH_ID_HERE'):
    print("you did not set an api_hash in the script.")
    api_hash = input('Please input api_hash: ')

#Authentication Token is saved to reuse in the future for less API prompts
#saved in whatever directory the command prompt is running from
client = TelegramClient('authenticationToken', api_id, api_hash).start()

#sets the program to connect to the chat channel listed.
#for example, 't.me/joinchat/ChatInviteCode' or 't.me/ChatName'
# If the code is not modified to have one built in, it will instead prompt the user at runtime.
url = 'URL_TO_JOIN_HERE'
if (url is 'URL_TO_JOIN_HERE'):
    print('you did not set a url in the script.')
    url = input("Please input a valid url: ")
channel = client.get_entity(url)

# get all the users and saves them to xls file
book = xlwt.Workbook()
sheet = book.add_sheet('Sheet 1')
i = 0

#writes their id, firstname, lastname, and username to spreadsheet
for u in client.get_participants(channel):
    sheet.write(i, 0, u.id)
    sheet.write(i, 1, u.first_name)
    sheet.write(i, 2, u.last_name)
    sheet.write(i, 3, u.username)
    i += 1

print('saving to spreadsheet...')
book.save('userlist.xls')