import requests
import datetime

# file_size if byte


def download_file(url, chunk_size=64 * 1024, file_size=100 * 1024 * 1024):
    chunk_read = 0
    s_time = datetime.datetime.now()
    e_time = None
    with requests.get(url, stream=True) as r:
        for chunk in r.iter_content(chunk_size):
            if chunk_read >= file_size:
                e_time = datetime.datetime.now()
                break
            if chunk:
                chunk_read += len(chunk)
    duration = (e_time - s_time).total_seconds()
    speed = chunk_read / duration / 1024 / 1024 * 8  # mega bit
    # print("{} MB download".format(chunk_read / 1024 / 1024))
    # print("{} seconds".format(duration / 1))
    return speed