python多线程方式执行多个bat代码

import threadingfrom win32api import *class MyThread(threading.Thread):  def __init__(self, bat_path, **kwargs):    threading.Thread.__init__(self, **kwargs)    self.bat_path = bat_path      def run(self):    ShellExecute(0, None, self.bat_path, None, "c:", True)  for i in range(1,4):  t = MyThread("c: est" + str(i) + ".bat")  t.start()