message: Skip if no python.
diff: --TEST--
  swoole_process: exec
  --SKIPIF--
  -<?php require __DIR__ . '/../include/skipif.inc'; ?>
  +<?php
  +require __DIR__ . '/../include/skipif.inc';
  +if (!@file_exists('/usr/bin/python')) {
  + exit('skip if no python');
  +}
  +?>
  --FILE--
  <?php
  require_once __DIR__ . '/../include/bootstrap.php';
  