python异常错误子进程文件丢失-但是什么文件？

我有一个在python 2.7.3(windows)上运行的代码,我尝试在python 2.7.8(windows)上运行它并得到以下错误：

main：INFO **启动Main **

Traceback (most recent call last):
  File "C:\wamp\www\prenderer\src\main.py", line 82, in <module>
    nuke_process = launch_nuke()
  File "C:\wamp\www\prenderer\src\main.py", line 31, in launch_nuke
    query = subprocess.Popen(r"query process", stdout=subprocess.PIPE)
  File "F:\python27\lib\subprocess.py", line 710, in __init__
    errread, errwrite)
  File "F:\python27\lib\subprocess.py", line 958, in _execute_child
    startupinfo)
WindowsError: [Error 2] The system cannot find the file specified
>>> 

怎么了？

解决方法:

传递shell = True参数：

query = subprocess.Popen(r"query process", stdout=subprocess.PIPE, shell=True)

或将命令行参数作为列表传递：

query = subprocess.Popen(["query", "process"], stdout=subprocess.PIPE)

否则,查询过程将被识别为程序而不是查询.