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Python flask : TypeError: 'NoneType' object is not subscriptable [duplicate]

This question already has an answer here:

I am using flask to deploy my chatbot deep learning model. The model will run well when I run locally on python console. However when I try to deploy with flask, I get this exception:

Traceback (most recent call last): File
"C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 2309, in call
return self.wsgi_app(environ, start_response) File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 2295, in wsgi_app
response = self.handle_exception(e) File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 1741, in handle_exception
reraise(exc_type, exc_value, tb) File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflask_compat.py",
line 35, in reraise
raise value File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 2292, in wsgi_app
response = self.full_dispatch_request() File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 1815, in full_dispatch_request
rv = self.handle_user_exception(e) File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb) File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflask_compat.py",
line 35, in reraise
raise value File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 1813, in full_dispatch_request
rv = self.dispatch_request() File "C:UserstabAppDataLocalProgramsPythonPython35libsite-packagesflaskapp.py",
line 1799, in dispatch_request
return self.view_functionsrule.endpoint File "C:Chatbot-Flask-Server-masterChatbot-Flask-Server-masterapp-.py",
line 60, in prediction
response = pred(str(request.json['message'])) TypeError: 'NoneType' object is not subscriptable

Here is my code:

# webapp
app = Flask(__name__, template_folder='./')


@app.route('/prediction', methods=['POST', 'GET'])
def prediction():
response = pred(str(request.json['message']))
return jsonify(response)

@app.route('/')
def main():
return render_template('index.html')


if __name__ == '__main__':
app.run(debug=True)


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

request.json

None

request.json['message']

if request.json:

request.get_json()

request.get_json()

TypeError: 'method' object is not subscriptable

TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.

1 Answer
1

Give this a try an see if that print statement prints anything.

import json


app = Flask(__name__, template_folder='./')


@app.route('/prediction', methods=['POST', 'GET'])
def prediction():
text = str(request.data)
print(request.data) #To check what you are sending
text = json.loads(text)
response = pred(str(text['message']))
return jsonify(response)

@app.route('/')
def main():
return render_template('index.html')


if __name__ == '__main__':
app.run(debug=True)


json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

print(request.data)

<form method=POST action=" url_for('prediction') "> <input type=text name="Enter your message" value="" maxlength="100"> <input type="submit" value="Submit" > </form>

<form action = "http://localhost:5505/prediction" method = "POST"> <p>Text <input type = "text" name = "Name" style="height:200px" /></p> <p><input type = "submit" value = "submit" /></p></form>

Method Not Allowed The method is not allowed for the requested URL.