Todo list app using Flask | Python (original) (raw)

Last Updated : 15 May, 2020

There are many frameworks that allow building your webpage using Python, like Django, flask, etc. Flask is a web application framework written in Python. Flask is based on WSGI(Web Server Gateway Interface) toolkit and Jinja2 template engine. Its modules and libraries that help the developer to write applications without writing the low-level codes such as protocols, thread management, etc. In this article, we will learn how to make a todo list app using the Flask framework. In this app, you can add your todo items and mark them as complete or incomplete.Installation:

pip install Flask

Basic setup : Step 1: First make basic folders

mkdir app && cd app && mkdir static && mkdir templates

Step 2: Make some basic python files to write the code and name it as you desire.Step 3: Run the below command to start the server

touch run.py the app

Step 4: Change directory to _app_-

cd app

Step 5: create models.py for database, routes.py for urls/views and __init__ file to package our app

touch models.py routes.py init.py

Step 6: Goto templates/ directory and create index.html file

cd templates && touch index.html

Step 7: Goto static/ directory and create main.css

cd static && touch main.css

Now, open the project folder using a text editor. The directory structure should look like this : run.py file

Python3 `

from app import app

if name == 'main': app.run(debug=True)

`

app/__init__.py file

Python3 `

from flask import Flask from flask_sqlalchemy import SQLAlchemy import os

file_path = os.path.abspath(os.getcwd())+"/todo.db"

app = Flask(name) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///'+file_path db = SQLAlchemy(app)

from app import routes

`

app/routes.py file

Python3 `

from flask import render_template, request, redirect, url_for from app import app from app.models import Todo from app import db

@app.route('/') def index(): incomplete = Todo.query.filter_by(complete=False).all() complete = Todo.query.filter_by(complete=True).all()

return render_template('index.html', incomplete=incomplete, complete=complete)

@app.route('/add', methods=['POST']) def add(): todo = Todo(text=request.form['todoitem'], complete=False) db.session.add(todo) db.session.commit()

return redirect(url_for('index'))

@app.route('/complete/') def complete(id):

todo = Todo.query.filter_by(id=int(id)).first()
todo.complete = True
db.session.commit()

return redirect(url_for('index'))

`

app/models.py file

Python3 `

from app import db

class Todo(db.Model): id = db.Column(db.Integer, primary_key=True) text = db.Column(db.String(200)) complete = db.Column(db.Boolean)

def __repr__(self):
    return self.text

`

app/main.html

html `

Todo List

`

app/main.css

[sourcecode langauge="html"] body{ background:black; color:red; margin-top: 5px; } .button{ color:green; } .mark{font-size: 10px;} [/sourcecode]

Run the todo app using the below command

python run.py