Renames files based on their SHA1 hash. Meant for images.

sha-rename.py

#!/usr/bin/env python

'''
    USE AT YOUR OWN RISK!
    This script occasionally corrupts my files, this might be an error in the renaming process. 
    I only use this script for a bunch of meaningless photos that I don't mind losing.
    You have been warned!
'''

__author__ = "Kenan Yildirim"

import os
import time
import sys
from hashlib import sha1

def shaChecksum(filePath):    # Modified version of snippet found here: http://joelverhagen.com/blog/2011/02/md5-hash-of-file-in-python
    fh = open(filePath, 'rb')
    m = sha1()
    while True:
        data = fh.read(8192)
        if not data:
            break
        m.update(data)
    return m.hexdigest()

def main():
    start = time.time()
    for fname in os.listdir('.'):
        fileExtension = fname[(len(fname) - 4):]    # Obviously assuming a four character extension (including the dot)
        if '.py' not in fileExtension:
            shaHash = shaChecksum(fname)[:7]
            print 'Converting ' + fname + ' to ' + shaHash + fileExtension
            os.rename(fname, shaHash + fileExtension)
    print 'Done in %.3f seconds.' % (time.time() - start)
            
if __name__ == '__main__':
    sys.exit(main())