Questions tagged [flask]
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114
questions
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15
views
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.
0
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13
views
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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17
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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 ...
0
votes
1
answer
24
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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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votes
2
answers
984
views
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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0
answers
12
views
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 ...
0
votes
1
answer
37
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/...
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1
answer
74
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">
...
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16
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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 ...
0
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1
answer
31
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
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2
answers
29
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 ...
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16
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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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votes
1
answer
258
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
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1
answer
135
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
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1
answer
127
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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0
answers
36
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 ...
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0
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50
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
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1
answer
85
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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1
answer
85
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
1
answer
1k
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
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1
answer
71
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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177
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
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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1
answer
308
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
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1
answer
88
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
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1
answer
97
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
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1
answer
60
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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0
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419
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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0
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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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0
answers
22
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
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2
answers
2k
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
1
answer
277
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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0
answers
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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1
answer
49
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
1
answer
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 ...
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0
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49
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
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1
answer
77
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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1
answer
196
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
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0
answers
33
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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0
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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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0
answers
571
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
1
answer
1k
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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0
answers
115
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
1
answer
364
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
1
answer
119
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
1
answer
34
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
1
answer
340
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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0
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47
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 ?
1
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2
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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
1
answer
43
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 ...