Contacts-Database-App

This is a simple command line interface for a contact list program using Python and SQLite3.

The program allows a user to add, update, delete, and view contacts.

The program first checks if a database file 'contacts.db' exists. If it doesn't, then it creates the database file with a table named 'contacts' that stores a contact's first name, last name, phone number, and email address. If the database file already exists, then the program connects to it.

The program offers four options:

1. Add a contact: Prompts the user for a new contact's first name, last name, phone number, and email address.
2. Update a contact: Prompts the user to enter a contact's name and presents the user with a menu of options to update that contact's information (first name, last name, phone number, or email address).
3. Delete a contact: Prompts the user to enter a contact's name and then deletes that contact from the database.
4. View all contacts: Displays all the contacts in the database.

When the user exits the program, any changes made to the database are committed and the database connection is closed.