Find out if the python program is running in a docker container

test_docker.py

#!/usr/bin/env python3

def runningInDocker():
    with open('/proc/self/cgroup', 'r') as procfile:
        for line in procfile:
            fields = line.strip().split('/')
            if 'docker' in fields:
                return True

    return False
  
  
print(runningInDocker())