scrapeSingleGroup.py

from telethon import TelegramClient, sync
from dotenv import load_dotenv
import os
import csv

def main():
    # Get ENV variables from the '.env' file
    load_dotenv()
    api_id = os.getenv('API_ID')
    api_hash = os.getenv('API_HASH')
    phone = os.getenv('PHONE')
    fileName = input("Enter the File Name: ")
    fileName = fileName + '.csv'
    
    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 OTP: '))

    groups_list = []
    group = {}

    # Get's a List of Dictionaries with Group name with Group ID
    for d in client.get_dialogs():
        try:
            if d.is_group and not d.is_channel and d.name != '':
                group = {
                    "id": d.entity.id,
                    "title" : d.entity.title
                }
                groups_list.append(group)
        except:
            continue

    print('Choose a group to scrape members from:')
    i=0
    for g in groups_list:
        print(str(i) + '- ' + g['title'])
        i+=1

    g_index = input("Enter a Number: ")
    target_group = groups_list[int(g_index)]

    print('Fetching Members...')
    all_participants = []

    all_participants = client.get_participants(target_group["title"])

    print('Saving In file...')
    with open(fileName, mode="w",encoding='UTF-8') as f:
        writer = csv.writer(f,delimiter=",",lineterminator="\n")
        writer.writerow(['username', 'phone','group', 'user_id', 'group_id'])
        for user in all_participants:
            if user.username:
                username = user.username
            else:
                username = ""
            if user.phone:
                phone = user.phone
            else:
                phone = ""
            if user.id:
                user_id = user.id
            else:
                user_id = ""
            if target_group["title"]:
                group = target_group["title"]
            else:
                group = ""
            if target_group["id"]:
                group_id = target_group["id"]
            else:
                group_id = ""
            writer.writerow([username, phone, group, user_id, group_id])      
    print('Members scraped successfully.')

# Generates '.env' File in the project Directory
def generateENV():
    print("Generating ENV File")
    envData = []
    dataName = ['API_ID', 'API_HASH', 'PHONE']
    print("Enter the Required Credentials:")
    index = 0
    for i in dataName:
        data = input('{}: '.format(i))
        envData.append(data)
    with open(".env", mode="w",encoding='UTF-8') as f:
        for index in range(len(envData)):
            f.write('{0} = \'{1}\'\n'.format(dataName[index], envData[index]))
    return

if __name__ == "__main__":
    print("Checking .env file")
    if os.path.isfile('.env'):
        main()
    else:
        generateENV()
        main()