小编Mat*_*hew的帖子

为什么子Popen.pid进程pid()与ps命令返回的值不同？

当我ps从python(with subprocess.call())和另一个终端调用时,我注意到了这一点.

这是一个简单的python文件来测试:

#!/usr/bin/python3
'''
Test subprocess termination
'''

import subprocess

command = 'cat'

#keep pipes so that cat doesn't complain
proc = subprocess.Popen(command,
                    stdout=subprocess.PIPE,
                    stderr=subprocess.PIPE,
                    stdin=subprocess.PIPE,
                    shell=True)

print('pid = %d' % proc.pid)
subprocess.call("ps -A | grep -w %s" % command,
                    shell=True)

proc.terminate()
proc.wait()             # make sure its dead before exiting pytyhon

通常报告的pid比报告的pid ps多1或2 Popen.pid.