Flask Value error view function did not return a response

Question

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    gt   0   Check The weather         print  Test           return  Shutting your window          Close the window Tom s job      if float data  main    temp     gt   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    lt  DOCTYPE html gt   lt html lang  en  gt   lt body gt       lt h1 gt Enter a place lt  h1 gt       lt form action     method  POST  gt           lt input type  text  name  text  gt           lt input type  submit  name  my-form  value  Send  gt       lt h1 gt Options lt  h1 gt       lt p gt Open window if temp is greater than lt input type  textbox  name  open  gt  lt  input gt   lt input type  radio  name  scale  value  kelvin  gt Kelvin lt  input gt  lt input type  radio  name  scale  value  celcius  gt Celcius lt  input gt  lt input type  radio  name  scale  value  fah  gt FarenHeit lt  input gt  lt  p gt       lt  form gt   lt  body gt   lt  html gt    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

User · Accepted Answer

The following does not return a response   You must return anything like return afunction   or return  a string    This can solve the issue

User · Answer

You are not returning a response object from your view my form post  The function ends with implicit return None  which Flask does not like   Make the function my form post return an explicit response  for example  return  OK    at the end of the function

[python] Flask Value error view function did not return a response

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