Finding duplicates in directory (and move them too - optional)

duplicates.py

# python 3
import os
import hashlib
import shutil

def md5(fname):
    hash_md5 = hashlib.md5()
    with open(fname, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            hash_md5.update(chunk)
    return hash_md5.hexdigest()

listofFiles = []
listofDuplicates = []
rootDir = '.'
for dirName, subdirList, fileList in os.walk(rootDir):
   fileList = map(lambda x:dirName+"/"+x, fileList)
   for file in fileList:
      md5sum = md5(file)
      if md5sum not in listofFiles:
         listofFiles.append(md5sum)
      else:
         listofDuplicates.append(file)

print(listofDuplicates)

dest=""
if dest:
   for file in listofDuplicates:
      shutil.move(file, dest)