code: def authorize(self, ctx, identity, ops):
          '''Implements Authorizer.authorize by calling identity.allow to
          determine whether the identity is a member of the ACLs associated with
          the given operations.
          '''
          if len(ops) == 0:
              # Anyone is allowed to do nothing.
              return [], []
          allowed = [False] * len(ops)
          has_allow = isinstance(identity, ACLIdentity)
          for i, op in enumerate(ops):
              acl = self._get_acl(ctx, op)
              if has_allow:
                  allowed[i] = identity.allow(ctx, acl)
              else:
                  allowed[i] = self._allow_public and EVERYONE in acl
          return allowed, [f authorize(self, ctx, identity, ops):
          '''Implements Authorizer.authorize by calling identity.allow to
          determine whether the identity is a member of the ACLs associated with
          the given operations.
          '''
          if len(ops) == 0:
              # Anyone is allowed to do nothing.
              return [], []
          allowed = [False] * len(ops)
          has_allow = isinstance(identity, ACLIdentity)
          for i, op in enumerate(ops):
              acl = self._get_acl(ctx, op)
              if has_allow:
                  allowed[i] = identity.allow(ctx, acl)
              else:
                  allowed[i] = self._allow_public and EVERYONE in acl
          return allowed, []
docs: Implements Authorizer.authorize by calling identity.allow to
          determine whether the identity is a member of the ACLs associated with
          the given operations.