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Why am I getting the 404 error everytime i try to use the the server?

In all the tasks where I need a server, I am getting stack. If I run http-server or flask run (in different tasks), I get a 404 error. please help me fix this and check my work.
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Flask Dropzone implementation in Final Project

I need to implement a dropzone in my final project. It should work as follows: When the user uploads a file by dragging a file in the dropzone, it should be saved to the system at defined PATH. app = ...
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PSET9 Finance: USD function returns error only when both rendering Index AND after BUY completes a 'purchase'

"unsupported format string passed to Undefined.format"--I know this happens because the non-numerical value is passed into the USD function, but I can't seem to spot the culprit. As ...
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PSET9 FINANCE SQLITE "no such column exists" while multiplying two columns to update a third

In the Index function on APP.PY of my finance code, I'm getting "RuntimeError: no such column: total_per_share" even though I'm using "AS" to create this column -- please advise. @...
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AttributeError: 'function' object has no attribute 'method'

Hey guys I've been working on my final project. I keep running into this error When I run flask, this error occurs File "/home/ubuntu/project/app.py", line 88, in login if request.method == &...
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Unable to update the database in flask

I am building a CRUD application for student records but my update functionality is not working. I am trying to update the record by using the update query, it is not giving error but its not updating ...
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Flask/Python PSET9 Finance -- Using PRINT() to debug

Having some problems with INDEX that I figure printing variable content to console will help me solve. BUT no matter what I try, print(variable) doesn't result in anything at all on the console/...
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Lab9 -- Buttons to delete DB entries don't work

Can anyone please tell me why my "Remove Entry" from DB buttons don't work? I included the python.app code below the HTML: <!DOCTYPE html> <html lang="en"> ...
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cs50 Finance Invalid Syntax on function declaration

When working on Finance I encountered a syntax problem which higlights a function declaration def buy(): ^ SyntaxError: invalid syntax. I have a feeling that because such an obvious thing was ...
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Should I deploy flask app for the final project?

I’m working on a final project, which is a web application using Flask. For it to be graded, should I deploy it on Heroku or only submit my source files. I’m not familiar with Heroku, and from what I ...
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Is there a way in jinja to display a block in a specific page?

I have a layout.html page with a <footer> that I want to display in almost all pages using {% extends "layout.html %}. Only in the user profile page the footer will be different. How can I ...
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Finance: how does the "errorhandler" work?

I am trying to understand the errorhandler function in pset9 finance. In the given application.py: # Original version def errorhandler(e): """Handle error""" if ...
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Flask Filter Search/List in Python

I created a country list on the python search page section, the data is sent to the Html table with jinja syntax “ The Html table also has a JavaScript function it functions correctly no help with ...
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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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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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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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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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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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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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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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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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2 answers
398 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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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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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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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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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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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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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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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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2 answers
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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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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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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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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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2 votes
1 answer
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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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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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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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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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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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(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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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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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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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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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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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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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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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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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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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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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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