如何使用python获取程序PID

Question

我试图抓住openvpn pid，然后检查它是否正在运行，但此代码似乎无法正常工作。它告诉我＆＃39; pid＆＃39;当输出为＆＃39;＆nbsp;＆＃39;＆＃39;

时，它不是整数

import psutil
import time
import os
import subprocess

proc = subprocess.Popen(["pgrep openvpn"], stdout=subprocess.PIPE, shell=True)
(out, err) = proc.communicate()
out = out.strip()
print ("openvpn",out)
pid = out
time.sleep(5)
while True:
  if psutil.pid_exists(pid):
    print "a process with pid %d exists" % pid
    time.sleep(120)
  else:
    print "a process with pid %d does not exist" % pid
    time.sleep(5)
    os.system("")

Answer 1

'432'不是整数;它是一个包含数字的字符串。使用int()将其转换为整数。