在python中执行并行命令

Question

I'm trying to execute multiple linux commands using Python. Currently my script is

    import os
    os.system('cmd1')
    os.system('cmd2')
    os.system('cmd3')
    os.system('cmd4')

I'm wondering if there's a way to execute cmd1 and cmd2 in parallel. After cmd1 and cmd2 finishes, the system will execute cmd3 and cmd4? Thanks!

Answer 1

Use os.fork() and run the two system commands in two children. Use os.waitpid() on the two children before executing cmd3.