运行报错，页面无响应

[Nullthingxs]

`ERROR:tornado.application:Uncaught exception GET / (127.0.0.1)
HTTPServerRequest(protocol='http', host='127.0.0.1:9000', method='GET', uri='/', version='HTTP/1.1', remote_ip='127.0.0.1')
Traceback (most recent call last):
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1697, in _execute
result = method(*self.path_args, **self.path_kwargs)
File "/www/wwwroot/ctf/view/index.py", line 8, in get
self.render(nav='index')
File "/www/wwwroot/ctf/view/init.py", line 149, in render
self.finish(tmpl.render(**kwargs))
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1154, in finish
future = self.flush(include_footers=True)
File "/www/wwwroot/ctf/view/init.py", line 174, in flush
super(View, self).flush(include_footers, callback)
TypeError: flush() takes from 1 to 2 positional arguments but 3 were given
ERROR:tornado.application:Uncaught exception in write_error
Traceback (most recent call last):
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1697, in _execute
result = method(*self.path_args, **self.path_kwargs)
File "/www/wwwroot/ctf/view/index.py", line 8, in get
self.render(nav='index')
File "/www/wwwroot/ctf/view/init.py", line 149, in render
self.finish(tmpl.render(**kwargs))
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1154, in finish
future = self.flush(include_footers=True)
File "/www/wwwroot/ctf/view/init.py", line 174, in flush
super(View, self).flush(include_footers, callback)
TypeError: flush() takes from 1 to 2 positional arguments but 3 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1214, in send_error
self.write_error(status_code, **kwargs)
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1242, in write_error
% {"code": status_code, "message": self._reason}
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1154, in finish
future = self.flush(include_footers=True)
File "/www/wwwroot/ctf/view/init.py", line 174, in flush
super(View, self).flush(include_footers, callback)
TypeError: flush() takes from 1 to 2 positional arguments but 3 were given
ERROR:tornado.application:Exception in exception handler
Traceback (most recent call last):
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1697, in _execute
result = method(*self.path_args, **self.path_kwargs)
File "/www/wwwroot/ctf/view/index.py", line 8, in get
self.render(nav='index')
File "/www/wwwroot/ctf/view/init.py", line 149, in render
self.finish(tmpl.render(**kwargs))
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1154, in finish
future = self.flush(include_footers=True)
File "/www/wwwroot/ctf/view/init.py", line 174, in flush
super(View, self).flush(include_footers, callback)
TypeError: flush() takes from 1 to 2 positional arguments but 3 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1704, in _execute
self._handle_request_exception(e)
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1761, in _handle_request_exception
self.send_error(500, exc_info=sys.exc_info())
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1218, in send_error
self.finish()
File "/www/wwwroot/ctf/CTF_venv/lib/python3.7/site-packages/tornado/web.py", line 1154, in finish
future = self.flush(include_footers=True)
File "/www/wwwroot/ctf/view/init.py", line 174, in flush
super(View, self).flush(include_footers, callback)
TypeError: flush() takes from 1 to 2 positional arguments but 3 were given
`

系统环境如下：python3.7，Centos7.5，

[fy0]

时代变了，tornado 6.0 移除了 callback 参数，你直接把那行

super(View, self).flush(include_footers, callback)

改成

super(View, self).flush(include_footers)

应该就行了
https://www.tornadoweb.org/en/stable/web.html#tornado.web.RequestHandler.flush