Telegram Group Username Scraper

I need a small, reliable script that signs in with my Telegram API credentials and exports a clean list of every username present in a specific group I’ll provide. The job is focused only on user-profile data, and within that, only the “@username” handle—no messages, photos, or bios. I’ll be using the resulting list for marketing outreach, so accuracy and deduplication matter. A simple CSV or JSON file is perfect for the final output. Python with Telethon or Pyrogram is ideal, yet if you have a faster or more robust approach I’m open to it as long as it respects Telegram’s rate limits and my account’s safety. Deliverable: • A working script or small app that logs in via api_id / api_hash, accepts a group ID or invite link, and saves all usernames to file. • Short README or screencast showing setup, required Python version or runtime, and a quick demo run on a test group. I can supply a test group and credentials once we agree on the workflow, and I’ll consider the task complete when the script reliably pulls the same member count Telegram shows in-app and the file is formatted as specified.