Python - 我如何将长命令添加到子进程，当我在一行中应用时，整个命令不起作用

Question

我如何将这个完整的 export DISPLAY=:0.0 && python/home/src/upload.py %s %s & 命令添加到子进程？

# valid command
u ="""export DISPLAY=:0.0 && python /home/src/upload.py %s %s &""" % (s[1], s[2])
d ="""export DISPLAY=:0.0 && python /home/src/download.py %s %s &""" % (s[1], s[2])

# seems to work like this but need to add the u and d on this
subprocess.Popen(["python","/home/src/upload.py"], stdout=subprocess.PIPE)
subprocess.Popen(["python","/home/src/download.py"], stdout=subprocess.PIPE)

Answer 1

您可以将DISPLAY 变量添加到环境变量中；参数是参数列表的外部元素:

import os

env = os.environ.copy()
env['DISPLAY'] = ':0.0'

p1 = subprocess.Popen(["python","/home/src/upload.py"] + s[1:3], 
                      env=env, stdout=subprocess.PIPE)
p2 = subprocess.Popen(["python","/home/src/download.py"] + s[1:3], 
                      env=env, stdout=subprocess.PIPE)