How to open a large file from a URL into memory and create a hash in Python

Question

I am trying to create a function that will open files up to 20MB from a URL into memory. I need to create a consistent hash.

This is be closest I could get.

import os, hashlib, optparse, requests

def get_remote_sha_sum(url):

  url_file = requests.get(url)
  sha1 = hashlib.sha1()

  with open(url_file, "rb") as f:
    while True:
      data = f.read(65536)
      if not data:
        break
      sha1.update(data)

  return sha1.hexdigest()

if __name__ == '__main__':
  opt = optparse.OptionParser()
  opt.add_option('--url', '-u', default='https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf')

  options, args = opt.parse_args()
  print get_remote_sha_sum(options.url)

But it results in:

TypeError: coercing to Unicode: need string or buffer, Response found

I have tried dozens of things.'I went down the path of using BitesIO in which I am met with the same error message.

How do I open a large file in memory, buffer it, and create a hash?

Pls be kind, I'm still a little new to Python.