一个基于Python，提供类似Cron功能，并深受Java Quartz 影响的轻量级进程内任务调度框架。    <div id="features" class="section">     <h3>主要特性：</h3>     <ul class="simple">      <li>No (hard) external dependencies</li>      <li>Thread-safe API</li>      <li>Excellent test coverage (tested on CPython 2.4 - 2.7, 3.1 - 3.2, Jython 2.5.2, PyPy 1.4.1 and 1.5)</li>      <li>Configurable scheduling mechanisms (triggers):       <ul>        <li>Cron-like scheduling</li>        <li>Delayed scheduling of single run jobs (like the UNIX "at" command)</li>        <li>Interval-based (run a job at specified time intervals)</li>       </ul> </li>      <li>Multiple, simultaneously active job stores:       <ul>        <li>RAM</li>        <li>File-based simple database (shelve)</li>        <li><a class="reference external" href="/misc/goto?guid=4958193864039269840">SQLAlchemy</a> (any supported RDBMS works)</li>        <li><a class="reference external" href="/misc/goto?guid=4958183898586439931">MongoDB</a></li>       </ul> </li>     </ul>    </div>    <p><strong>项目主页：</strong><a href="http://www.open-open.com/lib/view/home/1326941559030" target="_blank">http://www.open-open.com/lib/view/home/1326941559030</a></p>