import hashlibimport os,sys def CalcSha1(filepath):    with open(filepath,'rb') as f:        sha1obj = hashlib.sha1()        sha1obj.update(f.read())        hash = sha1obj.hexdigest()        print(hash)        return hash def CalcMD5(filepath):    with open(filepath,'rb') as f:        md5obj = hashlib.md5()        md5obj.update(f.read())        hash = md5obj.hexdigest()        print(hash)        return hash         if __name__ == "__main__":    if len(sys.argv)==2 :        hashfile = sys.argv[1]        if not os.path.exists(hashfile):            hashfile = os.path.join(os.path.dirname(__file__),hashfile)            if not os.path.exists(hashfile):                print("cannot found file")            else                CalcMD5(hashfile)        else:                CalcMD5(hashfile)            #raw_input("pause")    else:        print("no filename")

1、文件二进打开。

2、对于MD5digest()==16位(bytes)

hexdigest()==32位(bytes)，

Sha1的digest()==20位hash值

hexdigest()==40位(bytes)hash值