ERROR:aiohttp.web:Error handling request Traceback (most recent call last): File "/home/weiwanliang/.local/lib/python3.5/site-packages/aiohttp/server.py", line 266, in start yield from self.handlerequest(message, payload) File "/home/weiwanliang/.local/lib/python3.5/site-packages/aiohttp/web.py", line 90, in handlerequest resp = yield from handler(request) File "/home/weiwanliang/blog/first-web/www/app.py", line 57, in logger return (yield from handler(request)) File "/home/weiwanliang/blog/first-web/www/app.py", line 72, in parsedata return (yield from handler(request)) File "/home/weiwanliang/blog/first-web/www/app.py", line 93, in auth return (yield from handler(request)) File "/home/weiwanliang/blog/first-web/www/app.py", line 110, in response r = yield from handler(request) File "/usr/lib/python3.5/asyncio/coroutines.py", line 209, in coro res = yield from res File "/home/weiwanliang/blog/first-web/www/coroweb.py", line 124, in _call logging.info(' %s : has_request_arg = %s, has_var_kw_arg = %s, get_named_args = %s, get_required_kw_args = %s ' % (__name, self._has_named_kw_args, self._named_kw_args, self._required_kw_args)) TypeError: not enough arguments for format string