I have implement simple app in flask. I can get data and process it also but how can I get random created folder. In this app, I tried to input some data to text area. When export deck button clicked then the data post to flask. I can get data and generate deck also but unable send generated deck file or redirect to the random folder.
I get the following error.
raise TypeError(
TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.)
So, How can I implement this? Redirect to new random generated folder or send the generated file as download link.
Thanks
app.py
from flask import Flask, render_template, request, redirect, url_for, flash, send_file, send_from_directory
import image_occ_deck_export
import random, os
app = Flask(__name__)
app.config["CACHE_TYPE"] = "null"
@app.route("/", methods=["GET","POST"])
def home():
if request.method == "POST":
print(request.form['notes'])
notes = request.form['notes']
# random folder
data = request.form['notes']
print(data)
random_f = random.randrange(1 << 30, 1 << 31)
create_random_folder(random_f, data)
else:
return render_template("index.html")
def create_random_folder(random_f, data):
directory = str(random_f)
parent_dir = "static/uploads/"
path = os.path.join(parent_dir, directory)
if not os.path.exists(path):
os.mkdir(path)
random_file = directory + ".txt"
random_deck_name = directory + ".apkg"
file_loc = path + "/" + random_file
deck_loc = path + "/" + random_deck_name
with open(file_loc, 'w') as f:
f.write(str(data))
image_occ_deck_export.exportDeck(file_loc, deck_loc)
return redirect(url_for('uploaded', path=path))
@app.route('/uploaded/<path>', methods=['GET'])
def uploaded():
return render_template("upload.html")
if __name__ == "__main__":
app.run(debug=False)
index.js
function export() {
var textToExport = document.getElementById("noteData").value;
var formData = new FormData();
formData.append("notes", textToExport);
var request = new XMLHttpRequest();
request.open("POST", "/");
request.send(formData);
}
index.html
<html>
<textarea id="noteData"></textarea>
<button onclick="export()">Export Deck</button>
</html>
sample input
cordova-img-occ-note-1602529000819 <img src='art-1851483_640.jpg'></img> <img src='cordova-img-occ-ques-1602529000819.svg'></img> <img src='cordova-img-occ-ans-1602529000819.svg'></img> <img src='cordova-img-occ-orig-1602529000819.svg'></img>
cordova-img-occ-note-1602529001248 <img src='art-1851483_640.jpg'></img> <img src='cordova-img-occ-ques-1602529001248.svg'></img> <img src='cordova-img-occ-ans-1602529001248.svg'></img> <img src='cordova-img-occ-orig-1602529000819.svg'></img>
cordova-img-occ-note-1602529001673 <img src='art-1851483_640.jpg'></img> <img src='cordova-img-occ-ques-1602529001673.svg'></img> <img src='cordova-img-occ-ans-1602529001673.svg'></img> <img src='cordova-img-occ-orig-1602529000819.svg'></img>
image_occ_deck_export.py The file use to generate anki deck from txt
import random
import genanki
import csv
import traceback
anki_deck_title = "learn"
anki_model_name = "image occ"
model_id = random.randrange(1 << 30, 1 << 31)
def exportDeck(data_filename, deck_filename):
try:
# front side
front = """
{{#Image}}
<div id="io-header">{{Header}}</div>
<div id="io-wrapper">
<div id="io-overlay">{{Question Mask}}</div>
<div id="io-original">{{Image}}</div>
</div>
<div id="io-footer">{{Footer}}</div>
<script>
// Prevent original image from loading before mask
aFade = 50, qFade = 0;
var mask = document.querySelector('#io-overlay>img');
function loaded() {
var original = document.querySelector('#io-original');
original.style.visibility = "visible";
}
if (mask === null || mask.complete) {
loaded();
} else {
mask.addEventListener('load', loaded);
}
</script>
{{/Image}}
"""
style = """
/* GENERAL CARD STYLE */
.card {
font-family: "Helvetica LT Std", Helvetica, Arial, Sans;
font-size: 150%;
text-align: center;
color: black;
background-color: white;
}
/* OCCLUSION CSS START - don't edit this */
#io-overlay {
position:absolute;
top:0;
width:100%;
z-index:3
}
#io-original {
position:relative;
top:0;
width:100%;
z-index:2;
visibility: hidden;
}
#io-wrapper {
position:relative;
width: 100%;
}
/* OCCLUSION CSS END */
/* OTHER STYLES */
#io-header{
font-size: 1.1em;
margin-bottom: 0.2em;
}
#io-footer{
max-width: 80%;
margin-left: auto;
margin-right: auto;
margin-top: 0.8em;
font-style: italic;
}
#io-extra-wrapper{
/* the wrapper is needed to center the
left-aligned blocks below it */
width: 80%;
margin-left: auto;
margin-right: auto;
margin-top: 0.5em;
}
#io-extra{
text-align:center;
display: inline-block;
}
.io-extra-entry{
margin-top: 0.8em;
font-size: 0.9em;
text-align:left;
}
.io-field-descr{
margin-bottom: 0.2em;
font-weight: bold;
font-size: 1em;
}
#io-revl-btn {
font-size: 0.5em;
}
/* ADJUSTMENTS FOR MOBILE DEVICES */
.mobile .card, .mobile #content {
font-size: 120%;
margin: 0;
}
.mobile #io-extra-wrapper {
width: 95%;
}
.mobile #io-revl-btn {
font-size: 0.8em;
}
"""
# back side
back = """
{{#Image}}
<div id="io-header">{{Header}}</div>
<div id="io-wrapper">
<div id="io-overlay">{{Answer Mask}}</div>
<div id="io-original">{{Image}}</div>
</div>
{{#Footer}}<div id="io-footer">{{Footer}}</div>{{/Footer}}
<button id="io-revl-btn" onclick="toggle();">Toggle Masks</button>
<div id="io-extra-wrapper">
<div id="io-extra">
{{#Remarks}}
<div class="io-extra-entry">
<div class="io-field-descr">Remarks</div>{{Remarks}}
</div>
{{/Remarks}}
{{#Sources}}
<div class="io-extra-entry">
<div class="io-field-descr">Sources</div>{{Sources}}
</div>
{{/Sources}}
{{#Extra 1}}
<div class="io-extra-entry">
<div class="io-field-descr">Extra 1</div>{{Extra 1}}
</div>
{{/Extra 1}}
{{#Extra 2}}
<div class="io-extra-entry">
<div class="io-field-descr">Extra 2</div>{{Extra 2}}
</div>
{{/Extra 2}}
</div>
</div>
<script>
// Toggle answer mask on clicking the image
var toggle = function() {
var amask = document.getElementById('io-overlay');
if (amask.style.display === 'block' || amask.style.display === '')
amask.style.display = 'none';
else
amask.style.display = 'block'
}
// Prevent original image from loading before mask
aFade = 50, qFade = 0;
var mask = document.querySelector('#io-overlay>img');
function loaded() {
var original = document.querySelector('#io-original');
original.style.visibility = "visible";
}
if (mask === null || mask.complete) {
loaded();
} else {
mask.addEventListener('load', loaded);
}
</script>
{{/Image}}
"""
# print(self.fields)
anki_model = genanki.Model(
model_id,
anki_model_name,
fields=[{"name": "id"},{"name": "Header"}, {"name": "Image"}, {"name": "Question Mask"}, {"name": "Footer"}, {"name": "Remarks"}, {"name": "Sources"}, {"name": "Extra 1"}, {"name": "Extra 2"}, {"name": "Answer Mask"}, {"name": "Original"}],
templates=[
{
"name": "Card 1",
"qfmt": front,
"afmt": back,
},
],
css=style,
)
anki_notes = []
with open(data_filename, "r", encoding="utf-8") as csv_file:
csv_reader = csv.reader(csv_file, delimiter="\t")
for row in csv_reader:
flds = []
for i in range(len(row)):
flds.append(row[i])
anki_note = genanki.Note(
model=anki_model,
fields=flds,
)
anki_notes.append(anki_note)
random.shuffle(anki_notes)
anki_deck = genanki.Deck(model_id, anki_deck_title)
anki_package = genanki.Package(anki_deck)
for anki_note in anki_notes:
anki_deck.add_note(anki_note)
anki_package.write_to_file(deck_filename)
print("Deck generated with {} flashcards".format(
len(anki_deck.notes)))
except Exception:
traceback.print_exc()
create_random_folder() returns a redirect, but when you call it from your home() request handler, you don’t do anything with the returned value and you don’t return a response in that code branch of your home() handler. It seems you intend to return that redirect from your home() handler like so:
return create_random_folder(random_f, data)
Remember, when you return a value from a function, you’re returning the value to the calling code, not to the browser. If you call a function from a request handler and receive a return value, that doesn’t automatically get sent back to the browser; you need to return it from the request handler.