Programming

import os
import os.path
import shutil
import sys

source = sys.argv[1]
destination = sys.argv[2]

while not os.path.exists(source):
source = raw_input('Enter a valid source directory\n')
while not os.path.exists(destination):
destination = raw_input('Enter a valid destination directory\n')

for root, dirs, files in os.walk(source, topdown=False):
for file in files:
extension = os.path.splitext(file)[1][1:].upper()
destinationPath = os.path.join(destination,extension)

if not os.path.exists(destinationPath):
os.mkdir(destinationPath)
if os.path.exists(os.path.join(destinationPath,file)):
print 'WARNING: this file was not copied :' + os.path.join(root,file)
else:
shutil.copy2(os.path.join(root,file), destinationPath)