We use pathlib and forward slashes so that the Path() function can be used to automatically convert backslash to forward slash on Linux systems.

Does directory exist?

from pathlib import Path

if not Path('C:/MyDirectoryname').is_dir():
   print("Does not exist")

Create Directory

from pathlib import Path
import os

if not Path('C:/MyDirectoryname').is_dir():
   os.makedirs('C:/MyDirectoryname')