📞 Phone Book CLI App (Python)

A simple command-line phone book application built in Python using Object-Oriented Programming (OOP) principles. It supports basic CRUD operations: Create, Read, Update, and Delete contacts.

✨ Features

• 📇 Create new contacts with full information (name, phone, email, address, category)
• 🔍 Search for contacts by first name
• ✏️ Update contact details (including nested fields like address or email)
• 🗑️ Delete contacts from the list
• 📋 Display all saved contacts
• ✅ Built-in validation for phone numbers and emails
• 💾 Temporary in-memory data storage (no database or file persistence yet)

🧱 Project Structure

Main Classes:

• Address – Stores contact's city, street, alley, and zipcode
• Category – Represents a contact category (family, friend, colleague, others)
• Contact_Info – Manages phone number and email with validation
• Person – Represents each contact with full details
• Phone_Book – Core class managing the list of contacts and all operations

🚀 How to Run

1. Make sure Python 3 is installed.
2. Save the code in a file, for example: phonebook.py
3. Run the app using your terminal or command prompt:

python phonebook.py