Build a Phone Tree with Python, Twilio and a State Machine

The tutorial provides a comprehensive guide on how to create an extensible phone tree using Python, the Flask web framework, and Twilio's Programmable Voice service. The phone tree is designed as a state machine with seven states: greeting, menu, sales, support, hours, reception, and error. Each state has an "enter" action that specifies what TwiML code to execute when entering the state, and an "exit" action that determines how to transition to the next state based on user input. The tutorial covers setting up a Flask server, creating a webhook for Twilio, configuring the webhook with ngrok, designing the state machine-driven phone tree, implementing individual states, and testing the completed project.