pythonUnicodeEncodeエラー

外部csvファイルに保存している検索キーワードを使ってYahooニュースを検索したいのですが、UnicodeEncodeエラーが出てしまい、色々調べましたがどう対処すればいいのかがわからなく困っています。

csv
1"麻薬","最新"

python
1
2url = 'https://news.yahoo.co.jp/search/?p=' 
3
4f = open('output.csv')
5dataReader = csv.reader(f)
6for row in dataReader:
7    tl = row[0]     
8    at = row[1]
9    url = url + str(tl) + str(at)
10
11    url = urllib.request.Request(url=url)
12    html = urllib.request.urlopen(url).read()

error
1Traceback (most recent call last):
2  File "test04.py", line 18, in <module>
3    html = urllib.request.urlopen(url).read()
4  File "/usr/lib64/python3.6/urllib/request.py", line 223, in urlopen
5    return opener.open(url, data, timeout)
6  File "/usr/lib64/python3.6/urllib/request.py", line 526, in open
7    response = self._open(req, data)
8  File "/usr/lib64/python3.6/urllib/request.py", line 544, in _open
9    '_open', req)
10  File "/usr/lib64/python3.6/urllib/request.py", line 504, in _call_chain
11    result = func(*args)
12  File "/usr/lib64/python3.6/urllib/request.py", line 1361, in https_open
13    context=self._context, check_hostname=self._check_hostname)
14  File "/usr/lib64/python3.6/urllib/request.py", line 1318, in do_open
15    encode_chunked=req.has_header('Transfer-encoding'))
16  File "/usr/lib64/python3.6/http/client.py", line 1239, in request
17    self._send_request(method, url, body, headers, encode_chunked)
18  File "/usr/lib64/python3.6/http/client.py", line 1250, in _send_request
19    self.putrequest(method, url, **skips)
20  File "/usr/lib64/python3.6/http/client.py", line 1117, in putrequest
21    self._output(request.encode('ascii'))
22UnicodeEncodeError: 'ascii' codec can't encode characters in position 15-18: ordinal not in range(128)