Questions tagged [flask]

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jinja code not working inside html file

I am using flask for the first time and jinja code is being displayed on the webpage. this is my html file: <!DOCTYPE html> <html lang="en"> <head> ...
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28 views

PSET9 / can't check until a frown turns upside down

I am getting this message in the following checks :| sell page has all required elements/ :| sell handles invalid number of shares :| sell handles valid sale I guess the problem is in by sell or buy ...
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Error in chreck50. No module named 'flask_login'

Results for cs50/problems/2021/x/finance generated by check50 v3.3.0 :) application.py exists :| application starts up check50 ran into an error while running checks! ModuleNotFoundError: No module ...
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21 views

ADD EXTRA CASH IN FINANCE

Trying to add extra cash to my pset finance. I have made as you can see below in the picture, that is adding an extra part of code to the index function(), but I'm just getting a 404 answer. Why is it ...
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When I am Running The Flask It works fine but when I am Opening it is Showing 500 Internal Server

from flask import Flask, render_template, request app = Flask(_ _Name_ _) @app.route("/") def index(): return render_template("index.html", name=request.args.get("name&...
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21 views

Week 9 - Finance. How could I check de return?

I am coding the week 9 problem (Finance) and I am part of (quote) and I have some doubts. The lookup () function returns (none) if the API does not find (stock). I am interested in how I check using ...
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1answer
25 views

Check if query returns empty value

I am trying to check using (IF / ELSE) if my query returns any value. What is the simplest way to do this? Thanks result = db.execute("SELECT * FROM home WHERE id = ? AND name = ?", str(conn)...
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76 views

Pset9 Finance| "Index table" doesn't display all the companies

I'm doing pset9 "Finance" and I've designed the two tables in the database, one with purchases and the other with transactions. Now when I render the index page, the shares of only one ...
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1answer
48 views

Runtime Error Unsupported Value in pset9 Finance

I'm doing Pset09 "Finance" and I have been stuck in the "index" function for quite a while. I tried to use the already existing "trans" table but I am getting an error. ...
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1answer
492 views

Calling a javascript function from flask

For my final project, I am creating a flask web mapping application, which with user input displays different things on a map. At the moment, when they input a place name via a form, my python ...
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1answer
58 views

pset9 // register function not registering user

I am having this problem with my register function in pset9 when i register on the web app it says error 500 internal server error and when i check my terminal it says: return self.view_functions[rule....
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121 views

What's wrong with my register function? (Pset9 - Finance)

Here's my register function in application.py: @app.route("/register", methods=["GET", "POST"]) def register(): """Register user""" ...
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2answers
169 views

CS50 IDE gives error for flask run

I was able to run flask run till yesterday. But today it is not working, it has been giving errors for SQL and I have been able to code today. It gives me this error continuously. ERROR: Error on ...
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54 views

Configure app not to use the filesystem

For the final project I have made an app and deployed it on heroku. From other questions I realized that heroku can't store changes for a long time, so I kept getting logged out as soon as I was ...
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261 views

jinja2.exceptions.UndefinedError

Hi all I am trying to get an app to work and i keep on getting an error jinja2.exceptions.UndefinedError jinja2.exceptions.UndefinedError: 'data' is undefined here is my code it would be great is ...
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1answer
192 views

Generate dynamic datefields from selected dropdown value sent to another route in Flask

EDIT With the good help of @DinoCoderSaurus, I realised that I overlooked adding a POST method to the datainput form and the routes also lacked GET and POST methods. Adding those modifications helped ...
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15 views

url_for not giving correct url

I am making a quiz app for the final project. i cannot give the parameters required through url_for. here is are the functions. functions: @app.route('/quiz') @login_required def quiz(): if ...
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125 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 ...
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1answer
35 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
76 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
36 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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46 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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54 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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184 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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3k 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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21 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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2answers
911 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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1answer
144 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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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
31 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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1answer
858 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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44 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 ...
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1answer
59 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 ...
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1answer
134 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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25 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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2k 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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331 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\...
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1answer
722 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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70 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}:...
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1answer
295 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 ...
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1answer
80 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 ...
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1answer
28 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</...
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1answer
270 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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46 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
984 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 * ...
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1answer
37 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 ...
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1answer
112 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 ...
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1answer
96 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-...
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2answers
2k 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
117 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 ...