script to leave all telegram groups

leave_all_telegram_groups.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 = 111111
api_hash = '2o23o13k1o3131'
phone = '+123456789'
client = TelegramClient(phone, api_id, api_hash)

client.connect()
if not client.is_user_authorized():
    client.send_code_request(phone)
    client.sign_in(phone, input('Enter the code: ')) # Enter the login code sent to your telegram 

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.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']

for chat in chats:
    try:
        if chat.megagroup== True and chat.title not in groups_to_exclude:
            client.delete_dialog(chat)
    except:
        continue

Thank you , added some features and made a new one https://gist.github.com/zodwick/46c7fd398e4616ded6dc5e0bc38da9fd , Hope it helps.

updated verison

from telethon.sync import TelegramClient
from telethon.tl.functions.messages import GetDialogsRequest
from telethon.tl.types import InputPeerEmpty
from telethon.errors import UserNotParticipantError, ChatAdminRequiredError, ChannelPrivateError
import telethon

api_id = '**************'
api_hash = '********************************'
phone_number = '+************'

client = TelegramClient(phone_number, api_id, api_hash)

client.connect()
if not client.is_user_authorized():
    client.send_code_request(phone_number)
    try:
        client.sign_in(phone_number, input('Enter the code: '))  # Enter the login code sent to your telegram
    except telethon.errors.SessionPasswordNeededError:
        password = input("Enter password: ")
        client.sign_in(password=password)

chats = []
last_date = None
chunk_size = 200

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

for chat in chats:
    try:
        # Check if the chat is a group or megagroup
        if hasattr(chat, 'megagroup') and chat.megagroup or hasattr(chat, 'broadcast') and chat.broadcast:
            client.delete_dialog(chat)
            print(f"Deleted group: {chat.title}")
    except UserNotParticipantError:
        print(f"Failed to delete {chat.title}: The target user is not a member of the specified megagroup or channel.")
    except ChatAdminRequiredError:
        print(f"Failed to delete {chat.title}: The target user is not an admin of the specified megagroup or channel.")
    except ChannelPrivateError:
        print(f"Failed to delete {chat.title}: The channel specified is private and you lack permission to access it. Another reason may be that you were banned from it.")
    except Exception as e:
        print(f"Failed to delete {chat.title}: {e}")

client.disconnect()