python3.5.2，環(huán)境是pycharm

去掉了spider_main中的try-except后發(fā)現(xiàn)報(bào)錯(cuò)如下：

Traceback?(most?recent?call?last):
??File?"S:/Python?Learning/baike_spider/spider_main.py",?line?43,?in?<module>
????obj_spider.craw(root_url)??#?啟動(dòng)爬蟲
??File?"S:/Python?Learning/baike_spider/spider_main.py",?line?26,?in?craw
????html_cont?=?self.downloader.download(new_url)
??File?"S:\Python?Learning\baike_spider\html_downloader.py",?line?10,?in?download
????resp?=?request.urlopen(url)
??File?"E:\Tools\Python\Python3.5\lib\urllib\request.py",?line?163,?in?urlopen
????return?opener.open(url,?data,?timeout)
??File?"E:\Tools\Python\Python3.5\lib\urllib\request.py",?line?466,?in?open
????response?=?self._open(req,?data)
??File?"E:\Tools\Python\Python3.5\lib\urllib\request.py",?line?484,?in?_open
????'_open',?req)
??File?"E:\Tools\Python\Python3.5\lib\urllib\request.py",?line?444,?in?_call_chain
????result?=?func(*args)
??File?"E:\Tools\Python\Python3.5\lib\urllib\request.py",?line?1297,?in?https_open
????context=self._context,?check_hostname=self._check_hostname)
??File?"E:\Tools\Python\Python3.5\lib\urllib\request.py",?line?1254,?in?do_open
????h.request(req.get_method(),?req.selector,?req.data,?headers)
??File?"E:\Tools\Python\Python3.5\lib\http\client.py",?line?1107,?in?request
????self._send_request(method,?url,?body,?headers)
??File?"E:\Tools\Python\Python3.5\lib\http\client.py",?line?1142,?in?_send_request
????self.putrequest(method,?url,?**skips)
??File?"E:\Tools\Python\Python3.5\lib\http\client.py",?line?984,?in?putrequest
????self._output(request.encode('ascii'))
UnicodeEncodeError:?'ascii'?codec?can't?encode?characters?in?position?10-12:?ordinal?not?in?range(128)

html_downloader模塊代碼：

#?coding:utf-8
from?urllib?import?request
class?HtmlDownloader(object):
????def?download(self,?url):
????????if?url?is?None:
????????????return?None
????????resp?=?request.urlopen(url)
????????if?resp.getcode()?!=?200:
????????????return?None
????????return?resp.read()

查了很多但越改越亂，求解謝謝！