progress_bars_manual.py

import time
import requests

# use a context manager to make an HTTP request and file
with requests.get("https://www.example.com/file.txt", stream=True) as r:
    with open('download.txt', 'wb') as file:

        # Get the total size, in bytes, from the response header
        total_size = int(r.headers.get('Content-Length'))

        # Define the size of the chunk to iterate over (Mb)
        chunk_size = 1

        # iterate over every chunk and calculate % of total
        for i, chunk in enumerate(r.iter_content(chunk_size=chunk_size)):

            # calculate current percentage
            c = i * chunk_size / total_size * 100

            # write current % to console, pause for .1ms, then flush console
            sys.stdout.write(f"\r{round(c, 4)}%")
            time.sleep(.1)
            sys.stdout.flush()