code: def __get_grants(self, target_file, all_grant_data):
          
          self.k.key = target_file
  
          the_grants = self.k.get_acl().acl.grants
  
          grant_list = []
  
          for grant in the_grants:
              if all_grant_data:
                  grant_list.append(
                      {"permission": grant.permission, "name": grant.display_name, "email": grant.email_address, "id": grant.id})
              else:
                  grant_list.append({"permission": grant.permission, "name": grant.display_name})
  
          return grant_list
docs: Return grant permission, grant owner, grant owner email and grant id  as a list.
          It needs you to set k.key to a key on amazon (file path) before running this.
          note that Amazon returns a list of grants for each file.
  
          options:
              - private: Owner gets FULL_CONTROL. No one else has any access rights.
              - public-read: Owners gets FULL_CONTROL and the anonymous principal is granted READ access.
              - public-read-write: Owner gets FULL_CONTROL and the anonymous principal is granted READ and WRITE access.
              - authenticated-read: Owner gets FULL_CONTROL and any principal authenticated as a registered Amazon S3 user is granted READ access