python：如何从另一个程序中使用命令行调用（以用户的键击作为输入）运行程序？

Question

I can run one program by typing: python enable_robot.py -e in the command line, but I want to run it from within another program.

In the other program, I imported subprocess and had subprocess.Popen(['enable_robot', 'baxter_tools/scripts/enable_robot.py','-e']) , but I get an error message saying something about a callback.

If I comment out this line, the rest of my program works perfectly fine.

Any suggestions on how I could change this line to get my code to work or if I shouldn't be using subprocess at all?

Answer 1

If enable_robot.py requires user input, probably it wasn't meant to run from another python script. you might want to import it as a module: import enable_robot and run the functions you want to use from there.

If you want to stick to the subprocess, you can pass input with communicate :

p = subprocess.Popen(['enable_robot', 'baxter_tools/scripts/enable_robot.py','-e'])
p.communicate(input=b'whatever string\nnext line')

communicate documentation , example .

Answer 2

Your program enable_robot.py should meet the following requirements:

• The first line is a path indicating what program is used to interpret the script. In this case, it is the python path.
• Your script should be executable

A very simple example. We have two python scripts: called.py and caller.py

Usage: caller.py will execute called.py using subprocess.Popen()

File /tmp/called.py

#!/usr/bin/python
print("OK")

File /tmp/caller.py

#!/usr/bin/python
import subprocess
proc = subprocess.Popen(['/tmp/called.py'])

Make both executable:

chmod +x /tmp/caller.py
chmod +x /tmp/called.py

caller.py output:

$ /tmp/caller.py

$ OK