Leave unwanted/spam Telegram Groups - also delete joined Telegram messages chats

telegram_cleanup.py

from telethon.sync import TelegramClient
from telethon.tl.functions.messages import GetDialogsRequest
from telethon.tl.types import InputPeerEmpty
# Go to https://my.telegram.org/apps, sign in, go to API development tools, create an app, copy and paste below:
api_id = 123456
api_hash = '303xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
phone = '+xxxxxxxxxxxx' 
client = TelegramClient(phone, api_id, api_hash)
client.connect()
if not client.is_user_authorized():
    client.send_code_request(phone)
    # Enter the login code sent to your telegram
    client.sign_in(phone, input('Enter the code: '))

chats = []
last_date = None
chunk_size = 200
groups = []

result = client(GetDialogsRequest(
    offset_date=last_date,
    offset_id=0,
    offset_peer=InputPeerEmpty(),
    limit=chunk_size,
    hash=0
))


chats = []

chats.extend(result.chats)

"""
Megagroups are groups of more than 200 people, if you want to leave 
smaller groups as well delete this part. If you want to stay in a few 
specific groups, add their titles to the groups_to_exclude list.
"""
groups_to_exclude = ['group title']
max_members = 10000


for chat in chats:
    try:
        if chat.megagroup== True and chat.title not in groups_to_exclude:
            client.delete_dialog(chat)
            print("Deleted {} as megagroup".format(chat.title))

        if chat.scam == True:
            client.delete_dialog(chat)
            print("Deleted {} as scam".format(chat.title))

        if chat.participants_count > max_members:
            client.delete_dialog(chat)
            print("Deleted {} as it has {} members".format(chat.title, chat.participants_count))
            
    except:
        continue

"""
----------------------------------
USE WITH CAUTION
----------------------------------
Use this part if you want to delete all your unread messages with one unread message in each chat.
Especially useful to delete xyz joined Telegram messages.

BUT BE CAREFUL, THIS WILL DELETE ALL YOUR UNREAD MESSAGES WITH ONE UNREAD MESSAGE IN EACH CHAT.
"""
dialogues = []
dialogues.extend(result.dialogs)

c = 0
for chat in dialogues:
    if chat.unread_count == 1:
        client.delete_dialog(chat)
        print(c)
        c += 1