import os
from pathlib import Path

# Assume a drive is mounted named "D:", in my test case a Samsung USB
# flash drive.

def is_dir(path_str):
    print("using os.path:", os.path.isdir(path_str))
    print("using pathlib:", Path(path_str).is_dir())

# Test mounted drive.
is_dir("D:\\")

#test C:\ drive.
is_dir("C:\\")