satie_get_contacts

import csv

from telethon import TelegramClient
# pip install telethon

api_id = 123456789
api_hash = '0123456789abcdef0123456789abcdef'

client = TelegramClient('anon', api_id, api_hash)

async def main():
    me = await client.get_me()
    print(f'Привет, {me.first_name}!')
    channel_name = input('Введите название канала, без "@": ')
    al = await client.get_dialogs()
    try:
        participants = await client.get_participants(channel_name)
    except:
        print('Invalid channel_name passed! Try again!')
        raise SystemExit(1)

    with open('users.csv', 'w', newline='') as file:
        fieldnames = ['Имя пользователя', 'Имя', 'Фамилия', 'Номер телефона']
        csvwriter = csv.DictWriter(file, fieldnames=fieldnames)
        csvwriter.writeheader()
        for participant in participants:
            print('Username:', participant.username)
            print('First name:', participant.first_name)
            print('Last name:', participant.last_name)
            print('Phone number:', participant.phone, end='\n\n')
            csvwriter.writerow({'Имя пользователя': participant.username,
                                'Имя': participant.first_name,
                                'Фамилия': participant.last_name,
                                'Номер телефона': participant.phone})

with client:
    client.loop.run_until_complete(main())