from telethon import TelegramClient, sync

from telethon.tl.functions.channels import GetParticipantsRequest
from telethon.tl.functions.channels import GetFullChannelRequest
from telethon.tl.functions.messages import GetHistoryRequest
from telethon.tl.types import PeerUser, PeerChat, PeerChannel
from telethon.tl.types import ChannelParticipantsSearch
from telethon import utils
from telethon.tl.types import ChannelParticipantsAdmins
from telethon import errors
from time import sleep


api_id = 2222
api_hash = 'asdasd'
phone_number = '+phone'

################################################
# invite link for private channel

#channel_id = 1234
chat_id = 1234
#inveite_link='t.me/'
################################################

################################################

client = TelegramClient(phone_number,api_id,api_hash)

assert client.start()
if not client.is_user_authorized():
    client.send_code_request(phone_number)
    me = client.sign_in(phone_number, input('Enter code: '))

#for dialog in client.get_dialogs(limit=200):
#   print (dialog.id,dialog.name)

client.get_dialogs()
#channel = client.get_entity(inveite_link)
#channel = client.get_entity(PeerChannel(channel_id))
chat = client.get_entity(PeerChat(chat_id))

offset = 0
limit = 200

while True:
    participants = client(GetParticipantsRequest(
        chat, chat, offset, limit,hash=0))
    if not participants.users:
        break
    for _user in participants.users:
        print( _user.id,',', _user.username,',',_user.first_name,',',_user.last_name)
        # save User info to Database
    offset += len(participants.users)