#!/usr/bin/env python2.7  # -*- coding: utf-8 -*-    import threadpool   import time,random     """  安装threadpool  sudo easy_install threadpool  """    def threadpool_test(arg):       # 做一些事情      time.sleep(0.01)       return arg      def print_result(request, result):       print "结果 %s %r" % (request.requestID, result)      if __name__ == "__main__":      data = ['test_%d' % i for i in range(20)]          pool = threadpool.ThreadPool(5)       requests = threadpool.makeRequests(threadpool_test, data, print_result)       for req in requests:          pool.putRequest(req)         pool.wait()         print '结束！'