Questions tagged [flask]
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111
questions
0
votes
1answer
11 views
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/...
0
votes
1answer
27 views
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">
...
0
votes
0answers
12 views
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 ...
0
votes
1answer
22 views
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 ...
0
votes
2answers
19 views
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 ...
0
votes
0answers
12 views
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 ...
0
votes
1answer
77 views
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 ...
0
votes
1answer
40 views
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>
...
0
votes
1answer
44 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 ...
0
votes
0answers
23 views
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 ...
0
votes
0answers
42 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 ...
0
votes
0answers
11 views
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&...
0
votes
0answers
27 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
34 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
84 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
62 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
762 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
65 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....
0
votes
0answers
154 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
325 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
1answer
247 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
1answer
36 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
86 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
48 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
votes
0answers
261 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
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 ...
1
vote
2answers
1k 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
1answer
225 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
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
40 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 ...
2
votes
1answer
1k 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
votes
0answers
46 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
67 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
169 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
28 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
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) ...
0
votes
0answers
459 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
943 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
83 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
336 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
94 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
29 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
313 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
1k 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
39 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
126 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
votes
1answer
100 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
votes
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 ...
