#计算文件的CRC32值

 import sys

 import zlib

 import os.path

 filename=sys.argv[1]

 print(filename)

 if os.path.isfile(filename):

     fp=open(filename,'rb')

     contents=fp.read()

     fp.close()

     print(zlib.crc32(contents.encode()))

 else:

     print('file not exists')