每次我加载我的网页时，RunTimeError

Question

今天，当我开始对我的网页进行编码时，它正常工作，但是我的css文件突然失效了。我的变化没有更新。读了一会儿之后，我读到我应该清理我的缓存。我这样做了，然后当我运行我的网页并单击任意按钮时，我会在我的控制台中看到下一个输出：

127.0.0.1:50860 - - [22/Dec/2019 13:22:20] "HTTP/1.1 POST /check-login" - 200 OK
127.0.0.1:50861 - - [22/Dec/2019 13:22:20] "HTTP/1.1 GET /static/css/swap.css" - 304 Not Modified
RuntimeError('generator raised StopIteration')
127.0.0.1:50860 - - [22/Dec/2019 13:22:20] "HTTP/1.1 GET /" - 200 OK
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/web/httpserver.py", line 239, in __iter__
    raise StopIteration()
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/cheroot/server.py", line 1280, in communicate
    req.respond()
  File "/usr/local/lib/python3.7/site-packages/cheroot/server.py", line 1083, in respond
    self.server.gateway(self).respond()
  File "/usr/local/lib/python3.7/site-packages/cheroot/wsgi.py", line 145, in respond
    for chunk in filter(None, response):
RuntimeError: generator raised StopIteration
127.0.0.1:50860 - - [22/Dec/2019 13:22:20] "HTTP/1.1 GET /static/css/swap.css" - 304 Not Modified
RuntimeError('generator raised StopIteration')
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/web/httpserver.py", line 239, in __iter__
    raise StopIteration()
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/cheroot/server.py", line 1280, in communicate
    req.respond()
  File "/usr/local/lib/python3.7/site-packages/cheroot/server.py", line 1083, in respond
    self.server.gateway(self).respond()
  File "/usr/local/lib/python3.7/site-packages/cheroot/wsgi.py", line 145, in respond
    for chunk in filter(None, response):
RuntimeError: generator raised StopIteration

我的主文件如下：

import web   
from Models import RegisterModel, LoginModel

web.config.debug = False

urls = (
    '/', 'home',
    '/login', 'login',
    '/register', 'register',
    '/postregistration', 'postRegistration',
    '/check-login', 'checkLogin',
    '/logout', 'logout'

)

TEMPLATE_PATH = './Views/Templates'
BASE_FILE = 'MainLayout'


app = web.application(urls, globals())

session = web.session.Session(app, web.session.DiskStore("sessions"), initializer={'user': None})
session_data = session._initializer

render = web.template.render(TEMPLATE_PATH, base=BASE_FILE, globals={'session': session_data, 'current_user': session_data["user"]})
# Classes/Routes

class home:
    def GET(self):
        return render.home()

class login:
    def GET(self):
        return render.login()

class checkLogin:
    def POST(self):
        data = web.input()

        login_model = LoginModel.LoginModel()
        isCorrect = login_model.check_user(data)

        if isCorrect:
            session_data["user"]=isCorrect
            return isCorrect

        return "error"

class logout:
    def GET(self):
        session['user'] = None
        session_data['user'] = None
        session.kill()
        return "success"

class register:
    def GET(self):
        return render.register()

class postRegistration:
    def POST(self):
        data = web.input()

        reg_model = RegisterModel.RegisterModel()
        reg_model.insert_user(data)

        return data.username

if __name__ == "__main__":
    app.run()

如果你需要更多关于任何文件的信息，请告诉我。

提前谢谢。

Answer 1

类似的问题here。在python3.7中，StopIteration的规则发生了变化。

Python3.7中的所有代码都启用了

PEP 479，这意味着在coroutines和生成器中直接或间接引发的StopIteration异常被转换为RuntimeError异常。

您将需要使用try-除了在错误的地方，如上面的链接。

编辑

在您的代码中，似乎css没有更改，所以304没有修改StopIteration。

在./site-packages/web/httpserver.py中的__iter__函数中，您会发现这一部分。

def __iter__(self):
    # ...
    try:
        path = self.translate_path(self.path)
        etag = '"%s"' % os.path.getmtime(path)
        client_etag = environ.get("HTTP_IF_NONE_MATCH")
        self.send_header("ETag", etag)
        if etag == client_etag:
            self.send_response(304, "Not Modified")
            self.start_response(self.status, self.headers)
            return
    except OSError:
        pass  # Probably a 404

把这个加在底部。

except StopIteration:
    return

或者使用pass而不是return。这将重写同样的东西。