examples using os.walk()

[DeaD_EyE]

This example?

# !/usr/bin/python3
import os

os.chdir("d:\\tmp")
for root, dirs, files in os.walk(".", topdown = False):
   for name in files:
      print(os.path.join(root, name))
   for name in dirs:
      print(os.path.join(root, name))

I guess a filname or path on your filesystem is using invalid unicode.
The error happens in the function print. You can use a kind of hack to ship aroud this:

def encdec_hack(s):
    return s.encode("utf8", errors="ignore").decode()

for root, dirs, files in os.walk("."):
    for f in files:
        try:
            print("File [ OK  ]:", f)
        except UnicodeEncodeError:
            print()
            print("File [ ERR ]:", encdec_hack(f))

The best solution is: Fix your filesystem. Delete or rename the files with broken encoding.

It can also causes trouble with other Applications like an file explorer, backup tools etc...

BTW: The use of pathlib.Path has the same problem. The representation of the Path is ok
To print the representation of something:

print(repr(something))