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Mini Project: CLI To-Do App

Build a command-line To-Do app using lists, functions, and loops. This project brings together everything from Modules 1-4.

25 min•By Priygop Team•Updated 2026

CLI To-Do App

# Simple CLI To-Do App

def show_menu():
    print("\n=== TO-DO APP ===")
    print("1. View tasks")
    print("2. Add task")
    print("3. Complete task")
    print("4. Remove task")
    print("5. Exit")

def view_tasks(tasks):
    if not tasks:
        print("\n  No tasks yet!")
        return
    print("\n  Your Tasks:")
    for i, task in enumerate(tasks, 1):
        status = "✅" if task["done"] else "⬜"
        print(f"  {i}. {status} {task['title']}")

def add_task(tasks, title):
    tasks.append({"title": title, "done": False})
    print(f"  Added: {title}")

def complete_task(tasks, index):
    if 0 <= index < len(tasks):
        tasks[index]["done"] = True
        print(f"  Completed: {tasks[index]['title']}")
    else:
        print("  Invalid task number!")

def remove_task(tasks, index):
    if 0 <= index < len(tasks):
        removed = tasks.pop(index)
        print(f"  Removed: {removed['title']}")
    else:
        print("  Invalid task number!")

# Demo run (simulated - no input())
tasks = []
add_task(tasks, "Learn Python basics")
add_task(tasks, "Practice list operations")
add_task(tasks, "Build a project")
view_tasks(tasks)

complete_task(tasks, 0)
view_tasks(tasks)

remove_task(tasks, 2)
view_tasks(tasks)

print(f"\nTotal: {len(tasks)} tasks, {sum(1 for t in tasks if t['done'])} completed")

Try It Yourself: Extend the App

Try It Yourself: Extend the AppPython

Python Editor

✓ ValidTab = 2 spaces

# Mini To-Do - try adding more features!
tasks = []

def add(title):
    tasks.append({"title": title, "done": False})

def done(i):
    tasks[i]["done"] = True

def show():
    for i, t in enumerate(tasks):
        s = "✅" if t["done"] else "⬜"
        print(f"  {i+1}. {s} {t[#ce9178">'title']}")

# Add some tasks
add("Learn Python lists")
add("Practice slicing")
add("Build a project")
add("Review tuples & sets")

# Mark first two as done
done(0)
done(1)

# Show all tasks
print("=== My Tasks ===")
show()

# Count stats
total = len(tasks)
completed = sum(1 for t in tasks if t["done"])
print(f"\nProgress: {completed}/{total} ({completed/total*100:.0f}%)")

Output

Click ▶ Run to see the result

Edit the code on the left, then click Run (Ctrl+Enter)

Python|32 lines|653 chars|✓ Valid syntax

UTF-8

Tip

Use list of dicts for structured data: [{'title': 'task', 'done': False}]. It's cleaner than parallel lists and easier to extend.

Diagram

Loading diagram…

Everything in Python is an object - use type() to check

Common Mistake

Warning

Modifying list indices without bounds checking causes IndexError. Always validate: if 0 <= index < len(tasks): before accessing.

Practice Task

Note

(1) Add a priority field to tasks. (2) Sort tasks by priority. (3) Add a search function. (4) Count completed vs pending tasks.

Topics in This Module