subprocess can be used to run a command on the same system as your Python program. Here is the minimal boilerplate code without any error handling to create the /tmp/foo directory on the same system as your Python program.

#!/usr/bin/python3
import subprocess

subprocess.Popen("mkdir /tmp/foo", shell=True)

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

#!/usr/bin/python3
import subprocess

try:
  subprocess.Popen("mkdir /tmp/foo", shell=True)
except Exception as exception:
  print(exception)
else:
  print(f"successfully created the /tmp/foo directory")

Almost always, you are going to want to capture both stdout and stderr.

#!/usr/bin/python3
import subprocess

command = "pwd"

try:
  stdout, stderr = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
except Exception as exception:
  print(f"got the following exception: {exception}")
else:
  stdout = stdout.decode('utf-8').strip()
  stderr = stderr.decode('utf-8').strip()
  if stdout:
    print(f"stdout = {stdout}")
  if stderr:
    print(f"stderr = {stderr}")