Python Lesson 25: Mini Projects

The best way to learn is by building. Here are 3 complete mini projects that use everything you’ve learned. Build each one yourself — then check the solution.

Project 1: Quiz Game

# A terminal quiz with 5 questions
import random

questions = [
    {"q": "What is 2 ** 10?", "a": "1024"},
    {"q": "What function removes the last item from a list?", "a": "pop"},
    {"q": "What does len() return?", "a": "length"},
    {"q": "What keyword starts a function?", "a": "def"},
    {"q": "What type is True and False?", "a": "bool"}
]

random.shuffle(questions)
score = 0

print("Welcome to the Python Quiz!")
print("-" * 30)

for i, q in enumerate(questions, 1):
    answer = input(f"Q{i}: {q['q']} ").strip().lower()
    if answer == q["a"]:
        print("Correct! +1 point")
        score += 1
    else:
        print(f"Wrong. Answer was: {q['a']}")

print(f"\nFinal Score: {score}/5")
if score == 5:
    print("Perfect! You are a Python expert!")
elif score >= 3:
    print("Good job! Keep practicing.")
else:
    print("Keep studying! You will get there.")

Project 2: Contact Book

import json
import os

FILE = "contacts.json"

def load(): 
    if os.path.exists(FILE):
        with open(FILE) as f: return json.load(f)
    return {}

def save(contacts):
    with open(FILE, "w") as f: json.dump(contacts, f, indent=2)

def add_contact(contacts):
    name = input("Name: ").strip()
    phone = input("Phone: ").strip()
    email = input("Email: ").strip()
    contacts[name] = {"phone": phone, "email": email}
    save(contacts)
    print(f"{name} added!")

def search(contacts):
    name = input("Search name: ").strip()
    if name in contacts:
        c = contacts[name]
        print(f"{name}: {c['phone']} | {c['email']}")
    else:
        print("Not found.")

contacts = load()
while True:
    print("\n1=Add  2=Search  3=List  4=Quit")
    choice = input("Choice: ")
    if choice == "1": add_contact(contacts)
    elif choice == "2": search(contacts)
    elif choice == "3": 
        for name, info in contacts.items():
            print(f"{name}: {info['phone']}")
    elif choice == "4": break

Project 3: Daily Todo with JSON Storage

import json
import os
from datetime import date

TODO_FILE = "todos.json"

def load_todos():
    if os.path.exists(TODO_FILE):
        with open(TODO_FILE) as f: return json.load(f)
    return []

def save_todos(todos):
    with open(TODO_FILE, "w") as f: json.dump(todos, f, indent=2)

todos = load_todos()

while True:
    print(f"\nTodo List - {date.today()}")
    for i, t in enumerate(todos):
        status = "DONE" if t["done"] else "    "
        print(f"  [{status}] {i+1}. {t['task']}")
    
    print("\na=Add  d=Done  r=Remove  q=Quit")
    cmd = input("Command: ").strip().lower()
    
    if cmd == "a":
        task = input("New task: ").strip()
        todos.append({"task": task, "done": False})
    elif cmd == "d":
        n = int(input("Mark done (number): ")) - 1
        todos[n]["done"] = True
    elif cmd == "r":
        n = int(input("Remove (number): ")) - 1
        todos.pop(n)
    elif cmd == "q":
        save_todos(todos)
        print("Saved. Goodbye!")
        break
    
    save_todos(todos)