Get CRC32 checksum of a file

crc32.py

#!/usr/bin/env python
import sys
import zlib


def main():
    with open(sys.argv[1], 'rb') as f:
        data = f.read()
    print(hex(zlib.crc32(data)))

if len(sys.argv) == 2:
    main()
else:
    print("Please, point a file name to calculate CRC32 checksum")