Python子流程检查调用退出状态48

Question

我正在尝试用python运行subprocess.check_call，但是一直得到exit status 48。此命令通过OSX中的终端正常工作，退出状态为0:

/Users/me/Desktop/Python/ChannelAssign /Volumes/GRAID/_PREVIEWS/MASTER.mov

但这一直给我exit status 48：

import subprocess
subprocess.check_call(['/Users/me/Desktop/Python/ChannelAssign', '/Volumes/GRAID/_PREVIEWS/MASTER.mov'])

这给了我：

CalledProcessError: Command '['/Users/me/Desktop/Python/ChannelAssign', '/Volumes/GRAID/_PREVIEWS/MASTER.mov']' returned non-zero exit status 48