How to access variable value in Docker command when user passes command line arguments

Question

import sys
import os
import subprocess
        
app_name = sys.argv[1]
s = subprocess.call(
    "docker ps --filter name=$app_name| awk '{print $2}' > docker_tag.txt",
    shell=True
)

How can I access the value of the variable inside subprocess.call().

Rakesh · Accepted Answer · 2021-04-14 14:44:08Z

1

I believe you need f string

Ex:

import sys
import os
import subprocess

app_name=sys.argv[1]
s=subprocess.call(['docker', 'ps', '--filter', f"name={app_name}", '|', 'awk', "'{print", "$2}'", '>', 'docker_tag.txt'], shell=True)
# OR
#s=subprocess.call(f"docker ps --filter name={app_name}| awk '{print $2}' > docker_tag.txt", shell=True)

answered Apr 14, 2021 at 14:44

Rakesh

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3 Comments

Haridvpsk Over a year ago

getting syntax error when do use above code [centos@exe93-aws-mum:/exedge-volume/exedge]# python test.py upf-fpm File "test.py", line 6 s=subprocess.call(['docker', 'ps', '--filter', f"name={app_name}", '|', 'awk', "'{print", "$2}'", '>', 'docker_tag.txt'], shell=True) ^ SyntaxError: invalid syntax

Rakesh Over a year ago

is your Python version 3.6 and above?

Haridvpsk Over a year ago

[centos@exe93-aws-mum:~]# python3 --version Python 3.6.8

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