Python run system command and then exit… won't exit

问题

I have the following python code:

os.system("C:/Python27/python.exe C:/GUI/TestGUI.py")
sys.exit(0)

It runs the command fine, and a window pops up. However, it doesn't exit the first script. It just stays there, and I eventually have to force kill the process. No errors are produced. What's going on?

回答1:

instead of os.system use subprocess.Popen

this runs a command and doesn't wait for it and then exits:

import subprocess
import sys

subprocess.Popen(["mupdf", "/home/dan/Desktop/Sieve-JFP.pdf"])
sys.exit(0)

note that os.system(command) like:

p = subprocess.Popen(command)
p.wait()

回答2:

KeyboardInterrupts and signals are only seen by the process (ie the main thread). If your nested command hangs due to some kind of file read or write block, you won't be able to quit the program using any keyboard commands.

Why does a read-only open of a named pipe block?

If you can't eliminate the source of the disk block, then one way is to wrap the process in the thread so you can force kill it. But if you do this, you leave opportunity for half-written and corrupted files on disk.

回答3:

I suggest using os._exit instead of sys.exit, as sys.exit doesnt quit a program but raises exception level, or exits a thread. os._exit(-1) quits the entire program

回答4:

import sys ,subprocess

subprocess.Popen(["C:/Python27/python.exe", "C:/GUI/TestGUI.py"])
sys.exit(0)

Popen from subprocess module what you are looking for.

来源：https://stackoverflow.com/questions/6807102/python-run-system-command-and-then-exit-wont-exit