解析bittorrent跟踪器公告响应

Question

我试图从我的跟踪器中获取一个torrent的对等列表，方法是将repsonse解析为一个announced请求。这就是我所做的：

import sys,binascii,urllib.parse,urllib.request
from bcode import bdecode

def announce(inputurl):
    with urllib.request.urlopen(inputurl) as url:
        print(url.read())
        decoded = bdecode(url.read())
        print(decoded)

infohash = sys.argv[1] # Read info hash from command line

encoded_infohash = urllib.parse.quote(binascii.a2b_hex(infohash)) # Encode inf_hash
announce_url = "http://my_tracker_ip:6969/announce?info_hash=" + encoded_infohash
announce(announce_url)

当我为一个示例torrent的info_散列运行它时，会产生以下错误：

^{pr2}$

我不知道我哪里出错了。我使用的是python3.4.3