Hello, Space Explorer! Today, our focus is on calling functions in Python. By the end of the lesson, you'll understand how to call functions, utilize transitive function calling, employ named parameters, and return multiple values from a function.

Much like how using a remote control can switch on your television, calling a function tells Python to execute a block of code. It's akin to giving directions to your spaceship's computer. Let's use a common scenario in space journeys: greeting a new crew member. Consider this example:

In this instance, we instructed our spaceship's computer to greet the new team member, Astro Kid! Just as in saying "Hello" to a new crew member, calling a function executes the predefined code within that function.

In spaceship jargon, think of transitive function calling as delegating tasks on board your spacecraft. So, in fact, transitive function calling is just when you call one or multiple functions inside another function, delegating execution. Suppose we want to increase the heat in our spaceship's engine — instead of doing it ourselves, we assign the task to another function:

Here, as we prepare to launch the spacecraft, we call another function — power_up_engine(3) — to power up our spacecraft's engine. Afterward, we call another function - to delegate the processing of engine post-startup operations. You can see how one function can call another to perform a task.