Using the contact system in repl.it
Have you ever used Google Contacts, or an online service that uses the LDAP protocol? Those services use what is called a directory. You can find anyone that has an account for an online service using a directory.
This Python program simulates a directory using the Repl.it Database, which is supported with Python, and the simple CRUD (Create, Read, Update, Delete) functions.
Note: When updating a contact, and changing the name, but keeping the email, you need to enter in the new name, but re-enter the current email.