Build a To-Do List App Using Python and SQLite

Project introduction

A To-Do List App assists people to organize their work by giving them the possibility to add, view, update and delete enough tasks. Using SQLite will be an ideal solution, as it is a lightweight, serverless database that is embedded in the Python standard library, suitable and sufficient to be used in a small standalone application such as this. The ease of use of Python in combination with the low overhead database connections of SQLite enables a good foundation to construct a To-Do application.

Getting Your Development Environment Established

It is highly important to establish a decent development environment before going into coding:

• Python Installation: Make sure that your system is ready with python 3.
• SQLite: SQLite is included in Python through the sqlite3 module and one need not install SQLite separately.
• Virtual Environment: This is a collection of dependencies that allow setting up a virtual environment to maintain the project and allow controlling the project.
• Text Editor or IDE: Pick an editor that is practically VS Code or.

Other courses on Uncodemy available to new or anyone interested in structured learning include Python fundamentals and SQLite integration which are ideal in commencing such projects.

Database Design Database schema

This is because the To-Do app is centered on the task database. We shall have a table called tasks having the following columns:

• id (INTEGER PRIMARY KEY AUTOINCREMENT): unique identification task.
• name (TEXT, NOT NULL): task description.
• closed (BOOLEAN, NOT NULL): A flag to show whether the task is done or not.

The SQLite structure of this table is able to be generated using the SQL:

DONzTO SQL/CREATE TABLE IF NOT EXISTS tasks (

id INTEGER PRIMARY KEY AUTOINCREMENT (,

name TEXT NOT NULL,

closed BOOLEAN NOT NULL default 0

);

This schema will make sure every task will be assigned a unique ID, a name and a state of being completed.

Database Connection

To access an SQLite database file, we use the sqlite3 module of Python. This is the way to set it up:

import sqlite3

conectar_local = sqlite3.connect('tasks.db')

cur=conn.cursor()

# Make tasks table

cursor.execute('''

DONzTO SQL/CREATE TABLE IF NOT EXISTS tasks (

id INTEGER PRIMARY KEY AUTOINCREMENT (,

name TEXT NOT NULL,

closed BOOLEAN NOT NULL default 0

)

''')

conn.commit()

This script manipulates a database file created as tasks.db and initializes the table tasks in case it has not been created yet.

Creating the Application logic

An average To-Do List program will require the following essential features:

Add Task: Add a new task into the database.

List Tasks: Get and show all the tasks that are not complete.

Close Task: Finalise a task.

Delete Task (optional): Delete a task that is permanently removed off the database.

Add Task

In order to add a new task, one can get the user input of the task name and use it to insert the new task in the database through parameterized SQL to avoid injection:

def add_task(name):

with conn:

conn.execute("INSERT INTO tasks (name, closed) VALUES (?,0 )", (name,))

List Tasks

To show all the open tasks:

def list_tasks():

cursor = conn.execute(" SELECT id, name FROM tasks WHERE closed = 0 ")

cursor.fetchall()

Close Task

In order to indicate a task done:

def close_task(task_id):

with conn:

conn.execute("UPDATE tasks SET closed = 1 WHERE id = ?," , (task_id,))

The Simplest Console GUI

To keep things simple, we may develop a command-line interface using which the user may be shown a menu to select what to do:

def main():

while True:

print("\nTo-Do List")

print("1. View tasks")

print("2. Add task")

print("3. Close task")

print("4. Exit")

choice = input('Your choice:.delegate(select.user_out)

in the event that choice == 1:

tasks = list_tasks()

in tasks as task:

print(f"{task}. {task}")

else:

name = input("Name of task: ")

add_task(name)

print("Task added!")

elif choice =="3":

task_id= int(input("Enter task number to close: "))

close_task(task_id)

print("Task closed!")

elif choice =="4":

break

else:

print("Wrong decision, please do it again.")

This interface is simple and it works on the basis of user input.

Adding a Web Interface(Optional)

You may wish to develop into a web interface, which makes it friendlier to the user. Provided frameworks, such as Flask or Pyramid enable this action easily and a series of tutorials explaining how to utilize Mako or Jinja2 templates by using SQLite to render and process tasks on web pages exist.

As an example, a Flask application would contain routes to visualize the list of tasks, create new tasks through forms and change the state of tasks. This would enhance usability, particularly among non technical users.

Ways of Expanding the Learning Experience through Uncodemy Courses

Uncodemy provides training modules with all the aspects of Python programming, which allow training at basic levels up to advanced levels, and training integration of databases like SQLite. In case you want to increase your skills by going deeper than the basic To-Do app, the following topics of a relevant course apply:

Python Basics and Advanced discoveries: Learn to discover the foundations of Python.

SQLite and Python : How to interface Python with SQLite then apply it in real life.

Build web applications using Flask and Pyramid: Build an interaction with a database.

Full-stack Development: Develop your understanding of integrating the front and back-end tools.

Mobile App Development: An expansion of your knowledge should be towards mobile apps that can even gain database functions.

Those classes are both very well organized and practical, and they simplify creation of more advanced projects such as the To-Do app and beyond.

Best Practices and Hints

Parameterized Queries: SQL injection and ensuring security should be avoided by using parameterized SQL queries every time.

Close Database Connections: One should properly close database connections to prevent lock and resource leak.

Manage Input Validation: Check on the validity of user input to avoid insertion of blank or invalid tasks.

Apply Exceptions handling: Add error handling to handle possible run time problems courteously.

Scalability: In the event of expanding multi-user and bigger applications, convert to use more robust databases and frameworks with user authentication.

Conclusion

To learn the basic database management and app development, you should develop a To-Do List App in Python and SQLite and you will learn how to manage databases and create simple applications. You will begin with an application pushed to a console, but you will be able to extend your project in the future by reaching out to web frameworks such as Flask or Pyramid to make it more suitable to user experience. Moreover, Uncodemy has a great potential to offer great courses that might help you turn into a professional in Python and Databases usage or help you use it as a beginner successfully so that your educational path is effective.

With these skills learned, you will be in a good position of designing different data-driven applications that will add you to your programming portfolio and prospects of furthering your career.

Venture Uncodemy now to elevate your Python and SQLite expertise, and begin on your own To-Do List App project!

The blog combines the information about the installation of the SQLite database, application logic, user interface design, and association with helpful Uncodemy courses to offer both practical instructions on how to work and a guide to what you can learn in the future.