Execute terminal command over python

Question

I'm trying to get the hostname where the .py is running, so I used:

server = subprocess.Popen(["hostname"])
print(server.stdout)

However, I'm getting this return:

None
HOSTNAME

It always prints a None from the subprocess.Popen() and then the hostname at print(server.stdout). Is there a way to fix this?

No, it's printing None from print(server.stdout) (because you didn't tell it to capture stdout), and the subprocess is sending HOSTNAME directly to your terminal. You need to add a stdout=subprocess.PIPE parameter to Popen(). — jasonharper
– jasonharper, Commented Dec 13, 2022 at 16:12
Now it's returning <Popen: returncode: None args: ['hostname']> — null92
– null92, Commented Dec 13, 2022 at 16:13

Nice Zombies · Accepted Answer · 2022-12-14 09:25:07Z

2

I've three solutions so far:

Using Popen and stdout.read:

import subprocess
server = subprocess.Popen(["hostname"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
print(server.stdout.read().decode().rstrip("\n"))

Using Popen and communicate

import subprocess
server = subprocess.Popen(["hostname"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = server.communicate()
print(out.decode().rstrip("\n"))

Using check_output:

import subprocess
print(subprocess.check_output("hostname").decode().rstrip("\n"))

I'm wondering if you can get a string directly, but it works.

edited Dec 14, 2022 at 9:25

answered Dec 13, 2022 at 16:17

Nice Zombies

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6 Comments

null92 Over a year ago

To remove the b' prefix and \n' suffix should I use .replace?

Nice Zombies Over a year ago

Hold, up, I'll change it for you.

null92 Over a year ago

The server runs python 3.6. Is there an alternative for removesuffix()?

Nice Zombies Over a year ago

Sure, use rstrip or strip since it's just one character.

Nice Zombies Over a year ago

No, I've updated the response. (You should use decode)

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