DockerClient can be used to do something on Docker, such as list, start or stop containers. If you are not familar with the DockerClient, check out my article Python (Scripting) - Getting Started with DockerClient.

Here is the minimal boilerplate code without any error handling to restart the Docker container named 'hello-world'.

#!/usr/bin/python3
import docker
client = docker.DockerClient(base_url='unix:///var/run/docker.sock')
container = client.containers.get('hello-world')
container.restart()

Here is a more practical example, with try/except/else error handling.

#!/usr/bin/python3
import docker
import sys

try:
    client = docker.DockerClient(base_url='unix:///var/run/docker.sock')
except Exception as exception:
    print(exception)
    sys.exit(1)

try:
    container = client.containers.get('hello-world')
except Exception as exception:
    print(exception)
    sys.exit(1)


try:
    container.restart()
except Exception as exception:
    print(exception)
    sys.exit(1)
else:
    print(f"restart appears to have been successful"

sys.exit(0)