<Futr> = <Exec>.submit(<func>, <arg_1>, ...) <spanclass="hljs-comment"># Creates a thread and returns its Future object.</span>
<Futr> = <Exec>.submit(<func>, <arg_1>, ...) <spanclass="hljs-comment"># Creates a thread and returns its Future obj.</span>
<Exec>.shutdown(wait=<spanclass="hljs-keyword">True</span>) <spanclass="hljs-comment"># Blocks until all threads finish executing.</span>
<Exec>.shutdown(wait=<spanclass="hljs-keyword">True</span>) <spanclass="hljs-comment"># Blocks until all threads finish executing.</span>