Move file to parent directory if it's the only one there including sub-directories.

mv_one_file_to_parent.py

#!/bin/env/python
# -*- encoding: utf8 -*-
# Move file to parent directory if it's the only one there including sub-directories.
# usage: script.py <directory>
# script.py /stuff/files/

import os
import sys
from shutil import move

if len(sys.argv) <= 1:
    print("Directory not given")
    sys.exit(1)

topdir = os.path.abspath(sys.argv[1])

if not os.path.isdir(topdir):
  print("invalid directory")
  sys.exit(1)

for dirpath, dirnames, files in os.walk(topdir):
  if len(files) == 1 and len(dirnames) == 0:
    filename = os.path.join(dirpath, files[0])
    parentdir = os.path.dirname(dirpath)

    if os.path.isdir(parentdir):
        print("Moving '{0}' to {1}".format(filename, parentdir))
        move(filename, parentdir)