Calculate CRC32 in Python

Use binascii library with crc32 function to calculate CRC32.
import binascii def computeFileCRC(filename): try: blocksize = 1024 * 64 f = open(filename, "rb") str = f.read(blocksize) crc = 0 while len(str) != 0: crc = binascii.crc32(str,crc) & 0xffffffff str = f.read(blocksize) f.close() except: print "compute file crc failed!" return 0 return crc