Python Flask Value 错误视图函数没有返回响应
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Flask Value error view function did not return a response
提问by user3890963
Error message:
错误信息：
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:
还有我的代码：
#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.htmlis:
并且my-form.html是：
<!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 whileloop there it loads for ever.
如果我在while那里放一个循环，它会永远加载。
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.
然后输入一个比页面永远加载的当前温度更高的温度。如果我使用上面列出的当前代码，则会出现错误。
采纳答案by Avinash Babu
The following does not return a response:
以下不返回响应：
You must return anything like return afunction()or return 'a string'.
您必须返回类似return afunction()或 的任何内容return 'a string'。
This can solve the issue
这可以解决问题
回答by Antti Haapala
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.
您没有从您的视图中返回响应对象my_form_post。该函数以隐式结尾return None，这是 Flask 不喜欢的。
Make the function my_form_postreturn an explicit response, for example
使函数my_form_post返回显式响应，例如
return 'OK'
at the end of the function.
在函数的最后。
