code: def _prep_acl_for_compare(ACL):
      '''
      Prepares the ACL returned from the AWS API for comparison with a given one.
      '''
      ret = copy.deepcopy(ACL)
      ret['Owner'] = _normalize_user(ret['Owner'])
      for item in ret.get('Grants', ()):
          item['Grantee'] = _normalize_user(item.get('Grantee'))
      return ref _prep_acl_for_compare(ACL):
      '''
      Prepares the ACL returned from the AWS API for comparison with a given one.
      '''
      ret = copy.deepcopy(ACL)
      ret['Owner'] = _normalize_user(ret['Owner'])
      for item in ret.get('Grants', ()):
          item['Grantee'] = _normalize_user(item.get('Grantee'))
      return ret
docs: Prepares the ACL returned from the AWS API for comparison with a given one.