import glob
import os
import zlib

def crc(fileName):
    prev = 0
    for eachLine in open(fileName,"rb"):
        prev = zlib.crc32(eachLine, prev)
    return "%X"%(prev & 0xFFFFFFFF)

for file in glob.glob("C:/Your/File/Directory"):
    new_filename = file + '[' + str(crc(file)) + ']'
    os.rename(f,new_filename)