获取（大）文件md5

版权声明：本文为博主原创文章，转载请注明出处。 https://blog.csdn.net/nima1994/article/details/81178832

def GetFileMd5(filename):
    if not os.path.isfile(filename):
        return
    myhash = hashlib.md5()
    f = open(filename, 'rb')
    while True:
        b = f.read(8096)
        if not b:
            break
        myhash.update(b)
    f.close()
    return myhash.hexdigest()