hello world using tornado threads

hello_world_in_tornado.py

import tornado.gen
import tornado.process
import time


@tornado.gen.coroutine
def launch(pid):
  time.sleep(0.01 * pid)
  if pid != None:
    print("hello, world from process {:}".format(pid + 1))


def main():
  pid = tornado.process.fork_processes(None)
  launch(pid)


if __name__ == "__main__":
  main()