Flatten a Directory by moving all files up one level.

flatten.py

import os
import shutil

ROOT = '.'
for dirpath, dirnames, filenames in os.walk(ROOT):
    if dirpath == ROOT:
        continue
    for file in filenames:
        source = os.path.join(dirpath, file)
        destination = os.path.join(ROOT, file)

        # Skip existing,
        # First file wins
        if os.path.exists(destination):
            os.remove(source)
            continue

        # Move file up one level
        shutil.move(source, ROOT)


    # Delete Empty Folder
    if not os.listdir(dirpath):
        os.rmdir(dirpath)