Python_CRC32

 #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')