Flask Value错误视图函数没有返回响应 [英] Flask Value error view function did not return a response

问题描述

错误消息：
$ b $ pre $ Traceback（最近一次调用最后一次）：
文件/ usr / local / lib /python2.7/dist-packages/flask/app.py，第1836行，在__call__
中返回self.wsgi_app（environ，start_response）
文件/usr/local/lib/python2.7 /dist-packages/flask/app.py，第1820行，位于wsgi_app
response = self.make_response（self.handle_exception（e））
文件/usr/local/lib/python2.7 /dist-packages/flask/app.py，行1403，在handle_exception
reraise（exc_type，exc_value，tb）
文件/usr/local/lib/python2.7/dist-packages/ flask / app.py，第1817行，在wsgi_app
response = self.full_dispatch_request（）
文件/usr/local/lib/python2.7/dist-packages/flask/app.py第1478行，在full_dispatch_request
response = self.make_response（rv）
文件/usr/local/lib/python2.7/dist-packages/flask/app.py，第1566行，in make_response
提高ValueError（'查看函数没有返回响应'）
ValueError：查看函数离子没有返回回应


和我的代码：

 ＃用于启动烧瓶服务器
从烧瓶导入烧瓶#Import烧瓶主管
从烧瓶导入请求＃导入烧瓶请求
从烧瓶导入render_template＃导入烧瓶渲染模板
导入json，urllib #import api模块
导入时间#Import time in darlek voice 
 app = Flask（__ name__）
 
 @ app.route（'/'）
 def my_form（）：
 return render_template（my-form.html）＃设置渲染模板
 
 @ app.route（' /'，methods = ['POST']）
 def my_form_post（）：
 openwindow_at = float（request.form ['open']）打开窗口
 if request.form ['scale'] ==kelvin：#Change figures 
 print（Do nothing）#Debug info 
 elif request.form ['scale' ] ==celcius：
 openwindow_at = openwindow_at + int（273.15）#celcius to kelvin 
 elif request.form ['scale'] ==fah：#Fah to kelvin 
 openwindow_at =（openwindow_at + 459.67）* 5/9 #F开尔文
 text = request.form ['text']＃从第一页获取信息
 url =http：//api.openweathermap。 org / data / 2.5 / weather？q =+ text #Download the json 
 response = urllib.urlopen（url）#Download Json 
 data = json.loads（response.read（））#Parse json 
 print（当前天气+ text ++ data ['weather'] [0] ['description']）#Debug infomation 
 print（Temp：+ str ['main'] ['temp']））#print temp 
 
 if data ['weather'] [0] ['description']。find（rain）> = 0： #Check天气
 print（Test）
 return 关闭你的窗口
关闭窗口（汤姆的工作）
 if float（data ['main'] ['temp']）> = openwindow_at：
 return打开窗口 
＃打开窗口（Tom的工作）
 if __name__ =='__main__'：
 app.debug = True #Uncomment启用调试
 app.run（）#Run the服务器
  

和 my-form.html 是：

 <！DOCTYPE html> 
< html lang =en> 
< body> 
< h1>输入地点< / h1> 
 
< input type =textname =text> 
< input type =submitname =my-formvalue =Send> 
< h1>选项< / h1> 
< p>如果temp大于< input type =textboxname =open>< / input> < input type =radioname =scalevalue =kelvin> Kelvin< / input>< input type =radioname =scalevalue =celcius> < input type =radioname =scalevalue =fah> FarenHeit< / input>< / p> 
< / form> 
< / body> 
< / html> 
  

如果我在循环中放置加载永远。

然后输入一个高于当前页面加载的温度永远。
如果我使用上面列出的当前代码，则会给出错误信息。

解决方案

以下内容不返回响应：
$ b

你必须返回类似于 return afunction（）或 return'a string' 。

这可以解决问题

Error message:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1478, in full_dispatch_request
    response = self.make_response(rv)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1566, in make_response
    raise ValueError('View function did not return a response')
ValueError: View function did not return a response

And my code:

#Used for starting the flask server
from flask import Flask #Import flask mains
from flask import request #Import flask requests
from flask import render_template #Import flask render templates
import json, urllib #import api modules
import time #Imporing time in darlek voice
app = Flask(__name__)

@app.route('/')
def my_form():
    return render_template("my-form.html") #Set render template

@app.route('/', methods=['POST'])
def my_form_post():
    openwindow_at = float(request.form['open']) #When it reached ? open window
    if request.form['scale'] == "kelvin": #Change figures
        print("Do nothing") #Debug info
    elif request.form['scale'] == "celcius":
        openwindow_at = openwindow_at + int(273.15) #celcius to kelvin
    elif request.form['scale'] == "fah": #Fah to kelvin
        openwindow_at = (openwindow_at + 459.67) * 5 / 9  #F to kelvin
    text = request.form['text'] #Get info from First page
    url = "http://api.openweathermap.org/data/2.5/weather?q=" + text #Download the json
    response = urllib.urlopen(url) #Download Json
    data = json.loads(response.read()) #Parse json
    print("Current Weather in " + text + " " + data['weather'][0]['description']) #Debug infomation
    print("Temp: " + str(data['main']['temp'])) #Print temp 

    if data['weather'][0]['description'].find("rain") >= 0: #Check The weather
        print("Test")
        return "Shutting your window"
        Close the window(Tom's job)
    if float(data['main']['temp']) >= openwindow_at:
        return "Opening your window"
        #open the window (Tom's job)
if __name__ == '__main__':
    app.debug = True #Uncomment to enable debugging
    app.run() #Run the Server

and my-form.html is:

<!DOCTYPE html>
<html lang="en">
<body>
    <h1>Enter a place</h1>
    <form action="." method="POST">
        <input type="text" name="text">
        <input type="submit" name="my-form" value="Send">
    <h1>Options</h1>
    <p>Open window if temp is greater than<input type="textbox" name="open"></input> <input type="radio" name="scale" value="kelvin">Kelvin</input><input type="radio" name="scale" value="celcius">Celcius</input><input type="radio" name="scale" value="fah">FarenHeit</input></p>
    </form>
</body>
</html>

If I put a while loop there it loads for ever.

Then enter a temp higher than the current one the page loads forever. And if I use the current code listed above it gives the error.

解决方案

The following does not return a response:

You must return anything like return afunction() or return 'a string'.

This can solve the issue

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