code: def get_subscriber_hash(member_email):
      
      check_email(member_email)
      member_email = member_email.lower().encode()
      m = hashlib.md5(member_email)
      return m.hexdigest()
docs: The MD5 hash of the lowercase version of the list member's email.
      Used as subscriber_hash
  
      :param member_email: The member's email address
      :type member_email: :py:class:`str`
      :returns: The MD5 hash in hex
      :rtype: :py:class:`str`