查看python进程是否已经在运行的最佳方法是什么？

Question

我正在尝试编写一个脚本来监视我的python程序，看看它是否已经在运行。

我首先尝试将此脚本分配给一个对象：

processWatch = os.system("sudo ps afxj | grep quickConversion.py")
if processWatch > 2:  #if more than one is running it won't run.
    while 1:
        "rest of loop"

然后，我尝试监视该对象的多个实例。

Answer 1

您可能希望查看一下psutils来处理进程。

import psutil

processWatch = [p.cmdline() for p in psutil.process_iter()].count(['python', 'quickConversion.py'])
if processWatch > 0:
    `while 1: `
        `"rest of loop"`

Answer 2

有一些Linux命令可以返回进程列表：

if 'your_process' in commands.getoutput('ps -A'):
    print 'Your process in running.'

Answer 3

子进程的Popen对此非常有用。https://docs.python.org/3.4/library/subprocess.html

import subprocess

process = subprocess.Popen(cmd)
if process.poll() is None:
    print("The process hasn't terminated yet.")