Todo list app using Flask | Python
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
from app import app
if __name__ == '__main__':
app.run(debug=True)
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app/__init__.py file
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
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app/routes.py file
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/<id>')
def complete(id):
todo = Todo.query.filter_by(id=int(id)).first()
todo.complete = True
db.session.commit()
return redirect(url_for('index'))
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app/models.py file
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
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app/main.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Todo App</title>
<link rel="stylesheet" type="text/css" href="{{url_for('static', filename='main.css')}}">
</head>
<body>
<h1>Todo List</h1>
<div>Add a new todo item:
<form action="{{ url_for('add') }}" method="POST">
<input type="text" name="todoitem">
<input type="submit" value="Add Item" class="button">
</form>
</div>
<div>
<h2>Incomplete Items</h2>
<ul>
{% for todo in incomplete %}
<li style="font-size: 30pt" class='mark'>{{ todo.text }} <a href="{{ url_for('complete', id=todo.id) }}">Mark As Complete</a></li>
{% endfor %}
</ul>
<h2>Completed Items</h2>
<ul>
{% for todo in complete %}
<li style="font-size: 30pt">{{ todo.text }}</li>
{% endfor %}
</ul>
</div>
</body>
</html>
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app/main.css
body{
background:black;
color:red;
margin-top: 5px;
}
.button{
color:green;
}
.mark{font-size: 10px;}
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Run the todo app using the below command
python run.py
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