Questions tagged [flask]
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110
questions
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5 views
Running web applications (Django and/or Flask) on CS50 IDE
Hope you all are doing great.
Had a quick question about the CS50 IDE and running web applications on it.
One thing I noticed when running my web applications on CS50 IDE either by using "python ...
0
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1answer
18 views
Can't update shopping cart for more than one item, works fine for a single item, otherwise only the first one gets updated
I am trying to update the quantity of the products in the shopping cart by changing the number in the dropdown. If the cart has two or more items then only the first one works and the qty doesn't ...
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1answer
26 views
Blocked on C$50 Finance suggested personal touch feature - adapting index page to enable transactions in situ
Dug into the docs and trawled all the usual online sources but starting to suspect that I'm trying to solve this in a way that's impossible!
This is how I've edited the index page to allow user input ...
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1answer
16 views
Final Project: Problem to UPDATE table (Flask and SQLite) - RuntimeError (“unsupported value: {}”.format(value))
I'm working on a project tracking web app, in which users can create and categorise their own projects. There are more options, but a project can mainly be categorised as active or paid/finished. Any ...
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17 views
CS50 Web Track - Finance: OSError: [Errno 99] Cannot assign requested address
I'm trying to create a standard 'forgot password' feature for my web application. The issue is, when the user types in their email address and clicks submit to receive a token after which they can ...
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6 views
JavaScript functionalities not applied when JavaScript code written in an external .js file for a flask application
I'm working on project2 of CS50's web programming using python and javascript. I've made a .htm file and I need to write some javascript code for the page. I first wrote the code in an external file ...
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75 views
Final Project: Error on uploading files to CS50 IDE via form
tl;dr: CS50 IDE won't let me upload certain kinds of files (via a form on a webpage) without any explanation.
I'm writing the function upload_file() that allows the user to upload a file. (It's a CSV ...
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39 views
Problem with endblock tag in finance. “endblock” tag unknown
{% extends "layout.html" %}
{% block title %}
Quote
{% endblock %}
{% block main %}
<form action="/quote" method="post">
<div class="form-...
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764 views
raise JSONDecodeError(“Expecting value”, s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
@app.route('/api/<string:isbn>', methods = ['GET'])
def isbn(isbn):
#import api from Goodreads (stats)
book_data = db.execute("SELECT * FROM books WHERE isbn=:isbn",{'isbn':isbn})....
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17 views
I am working on project 1 and created .pylintrc file but db: scoped_session Instance of 'scoped_session' has no 'execute' memberpylint(no-member)
I am working on project 1 and I have also created the .pylintrc file and write ignored-classes=SQLObject,Registrant,scoped_session but still get db: scoped_session Instance of 'scoped_session' has no '...
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0answers
18 views
Final Project: dynamic page creation to show just 10 SQL entries per page
I'm developing a web-page for my CS50's Final Project for contacting japanese students around Argentina. The only official japanese exam takes place in Buenos Aires, and there are no many good places ...
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0answers
8 views
CS50w flack (chat) project: channel user list stops updating after a while, can't understand why
This is a weird one, so I've recorded a short video to better illustrate the problem.
As an additional feature to my chat app I have a panel on the right that displays the users currently on the ...
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0answers
23 views
Internal Server Error
Error Message: "Internal Server Error The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.&...
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2answers
139 views
Finance: UNIQUE constraint failed: users.username
I've been struggling with this for days. Ignore the '1234' hardcoded into the "insert into" line, just using that to isolate problems. The problem I'm facing is with the username being ...
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0answers
7 views
Does __tablename__ create a new table for each object? And what is .query.all? Is it a method?
I am really confused In CS50'S Web Programming with Python and Javascript-ORMs and APIs. There is weird syntax like class.query.all. What is Its definition (a method, a function, etc).
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21 views
Flask file uploading, processing and sending back
wondering if anyone can please share some useful resources for uploading, processing and downloading files within a Flask application. I have spent a lot of time looking for resources online, but the ...
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46 views
CS50 Web Flask-Login Issue: User Authentication Issue
I have a login page that uses a custom FlaskForm (using WTForms). If a user enters the correct credentials, a PostgreSQL database is successfully queried (using flask-sqlalchemy) to see if a user with ...
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1answer
45 views
RuntimeError: missing value for placeholder (:name)
all! I'm doing the final project, and I have a form whose contents I'm trying to submit to a database.
My python code is:
@app.route("/Contact.html", methods=["GET", "POST"])
def Contact():
if ...
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0answers
23 views
Session issue on CS50s project 1 Book Review
I need to learn more about session. I have book route which goes to a book page stating the description of the book, reviews from other users and write a review. I create a form in html and submit my ...
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0answers
18 views
Couldn't run the code
I'm trying to run the below code in cmd but I couldn't, it is saying "
Traceback (most recent call last):
File "list.py", line 3, in
from sqlalchemy import create_engine
ModuleNotFoundError: No ...
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0answers
19 views
Join table seems showing an error
I tried this statement on the adminer postgreSql database online database query tool and works but when i try to code it into my FLASK app showing nothing.
lists = db.execute("SELECT b.isbn,b.author,...
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1answer
20 views
problem with nesting sql queries in flask (final project)
I've been trying to only insert new ids if they weren't inserted before in my database but the problem I've been having is that I couldn't get the nested queries to work in python flask. Whatever I do ...
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0answers
122 views
CS50-Finance Flash message persisting throughout session after flask.redirect()
In my register() function, when registration is successful I have
flash("Registration successful","success")
before
return redirect("/")
The flashed message is displayed normally after rendering ...
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0answers
11 views
JS: How to interact with new HTML element created with javascipt?
I am learning javascript with the cs50w course. As part of Project2 I am developing a chat app, and my issue raises when I try to add new elements to a list of chat rooms, see them, and interact with ...
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56 views
Problem with Flask Flashing message - messages appears twice
I'm newbie at Flask. I am trying to manage the flash alerts to appear where I want them.
When I write the code get_flashed_messages() in the .html module the messages appears twice, without this code ...
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vote
1answer
306 views
Flask Sessions Not Working
I'm using VS Code and following along Brian's Flask class in Web50.
I have copied his notes program word for word, and somehow I get different results. I've downloaded Flask and Sessions, so that's ...
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0answers
16 views
Failing to extract data from html selector
I am currently doing the project1 of the CS50 web programming course and having issues extracting data from an html selector into a flask route.
I think its probably best if I just describe what I ...
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0answers
34 views
Trying to flask run the task session on the CS50 web Lecture DATABASE issue
I had a great time learning about HTML and CSS. Then came this intimidating flask feature. I was able to create a session["username"] to login and logout. I'm trying to use session to create a todo ...
0
votes
1answer
39 views
Internal Error Served if user doesn't own any shares or sell all his shares in Finance
When i sell all the shares i own or even in the case of a new registered user who doesn't own any shares; it doesn't redirect to "/" i.e the main index page but serves me an internal error. It works ...
0
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1answer
50 views
Unsure of what my DATABASE_URL is
I am using windows 10 (64-bit) and am following the course "Web Programming with python and Javascript" in CS50, in which i wanted to use my computer as a local host to store the table content. I am ...
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0answers
18 views
Deleting SQL dynamically with Flask
I want to delete a specific row in my database but I don't know how to do it.
On my HTML I have this:
<div class="cases">
{% for row in rows %}
<div class="card border-success mb-...
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0answers
10 views
A minor Web-app made with framework flask, having a minor problem
I've made a simple web-app here, the github repo of same is here. Actually, this performs a simple action, accepts three inputs from user via a registration form and as soon as the user hits up submit ...
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0answers
530 views
(psycopg2.errors.UndefinedTable) relation “users” does not exist
when i try to load up regster.html i get this error
"sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedTable) relation "users" does not exist
LINE 1: INSERT INTO users(username,password) ...
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0answers
122 views
CS50W: “flask.cli.NoAppException” Can anyone explain this?
flask.cli.NoAppException: While importing "application", an ImportError was raised: Traceback (most recent call last): File "c:\users\hp\appdata\local\programs\python\python38\lib\site-packages\flask\...
0
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1answer
188 views
error while trying to update database using python and sqlalchemy
While I was trying to run create.py file having the following code:
import os
from flask import Flask, render_template, request
from models import *
app = Flask(__name__)
app.config["...
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0answers
34 views
How to ensure proper database url in environment variable?
I am trying to run the code from lecture3 and I am having trouble ensuring the database url is properly set using the environment variable. Here's the code:
db_url = 'postgresql+psycopg2://{username}:...
0
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1answer
112 views
Can't access 127.0.0.1 and 0.0.0.0 in CS50 IDE
I am on my final project and i have a simple flask app and and index html template. There are no errors in my app, however when i run flask, flask run, it says Running on http://127.0.0.1:5000/ (Press ...
0
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1answer
38 views
Error in Flask application
Internal Server Error
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.
below is the code in ...
0
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0answers
93 views
CS50 Week 8 : Web Path - Flask Secret Key
I coded the code below following the lecture for CS50 Web path, for the database part
https://www.youtube.com/watch?v=zdH1PnWxSpA&feature=emb_title minutes 6
It runs fine on the video, but it ...
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0answers
15 views
How to send data from a function of an imported python file to a html template using flask in Python
I have two python files, one for calling the html template which I will run and the other which has the funtion I want to call. I'm fairly new to flask python programming.
When I run my main python ...
0
votes
1answer
24 views
finance: how to build an “active” table
I wish to know how to build a table (in HTML) where the row expand with the row I input on it.
For a static table I've used:
<table style="width:100%">
<tr>
<th>Symbol</...
0
votes
1answer
170 views
flask register, issue with importing cs50 module
Im trying to run a flask app locally with also using the cs50 module but i keep getting an error:
NoAppException: While importing "application", an ImportError was raised: Traceback (most recent ...
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0answers
91 views
failure at recreating register Flask --> NoAppException: Could not import “application”
Im trying to recreate the register app on my locally, however it seems the my application does not get pass importing the modules ?
This is my application code:
from cs50 import SQL
from flask ...
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0answers
42 views
Textbook for understanding session in flask or in general web development?
Is there any good text book available which can explain the concept of session in web development ?
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2answers
431 views
How do I turn debug mode ON in flask?
I have tried
export FLASK_ENV=development
then adding
app.config['DEBUG'] = True
to my program but i keep getting
* Serving Flask app "test.py" (lazy loading)
* Environment: development
* ...
0
votes
1answer
33 views
Getting a phishing warning when running flask on cs50 IDE
Everything was working fine, but suddenly my browsers and anti-virus spit out warnings when I want to run flask on the cs50 IDE.
I don't want to disable my antivirus every time I'm working on my ...
0
votes
1answer
75 views
CS50 Web Development Project 2 Attribute Error: module 'engineio' has no attribute 'WSGIApp'
This is my first time trying to run flask on Linux, I've made projects 0 and 1 in Windows 7. I've been able to run Project 2 on Windows, right before I switched to Linux. As I enter "flask run" on the ...
0
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1answer
82 views
cs50web socketio : broadcast does not include the sender
I work on ubuntu 18.04. I set up a virtual environment so that I am sure to work with python3 according to the instructions found here:https://vitux.com/install-python3-on-ubuntu-and-set-up-a-virtual-...
0
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2answers
524 views
How to pass value from HTML to python?
I'm setting up a new project in python ,and want to setting up a web pageresturant.html using FLASK , this code in html get the selected value from drop down box when button is clicked ,how can i pass ...
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1answer
88 views
PSET 6 [Similarities - less] How is the compare file accessed in this problem since it is not imported to application.py
(Dont be intimidated by length of code chunks, I included all of my guess as to what's going on, so most of it is just stuff to skim over)
The folder similarities contains static and template folders ...
