python 异常错误子进程文件丢失 - 但是什么文件？

Question

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 ** 开始 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？

Answer 1

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query process被识别为程序而不是query。