Questions tagged [flask]
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113
questions
0
votes
0answers
12 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 ...
0
votes
1answer
18 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)...
0
votes
0answers
48 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 ...
0
votes
1answer
34 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. ...
0
votes
1answer
248 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 ...
0
votes
1answer
29 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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0answers
82 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"""
...
0
votes
2answers
104 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 ...
0
votes
0answers
43 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 ...
0
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0answers
182 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 ...
0
votes
1answer
149 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 ...
0
votes
0answers
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 ...
0
votes
0answers
103 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
votes
1answer
32 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 ...
0
votes
1answer
66 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 ...
0
votes
1answer
31 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 ...
0
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0answers
44 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 ...
0
votes
0answers
22 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 ...
0
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0answers
100 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 ...
0
votes
0answers
138 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-...
0
votes
0answers
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})....
0
votes
0answers
28 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 '...
0
votes
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 ...
0
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0answers
11 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 ...
0
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0answers
26 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.&...
1
vote
2answers
619 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 ...
0
votes
0answers
8 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).
0
votes
0answers
22 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 ...
0
votes
0answers
61 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 ...
0
votes
1answer
102 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 ...
0
votes
0answers
25 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 ...
0
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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,...
0
votes
1answer
25 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 ...
1
vote
1answer
742 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 ...
0
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0answers
42 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
54 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
votes
1answer
96 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 ...
0
votes
0answers
22 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-...
0
votes
0answers
1k 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) ...
0
votes
0answers
307 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
votes
1answer
541 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["...
0
votes
0answers
66 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
votes
1answer
267 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
votes
1answer
71 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
votes
1answer
26 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
224 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 ...
0
votes
0answers
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 ?
0
votes
2answers
811 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
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 ...
0
votes
1answer
104 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 ...
