FAQ: Generators - next() and StopIteration

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This community-built FAQ covers the “next() and StopIteration” exercise from the lesson “Generators”.

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This exercise can be found in the following Codecademy content:

FAQs on the exercise next() and StopIteration

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so I have a question about the lesson material for generators. What exactly happens from start to finish in this code? Does the for loop iterate first and then does the yield statement act as a stopping point? How is the function getting what it needs to run? From the generator, if from the generator are the values from the yield statement is what is given to the function to run? Or is it generating numbers or code up to a certain point?

I am really confused.

Link to lesson material: https://www.codecademy.com/courses/learn-intermediate-python-3/lessons/int-python-generators/exercises/generator-functions-next-and-stopiteration

Generator functions return an iterator object that

contains traversable values. To retrieve the next value

from a generator object, we can use the Python built-in

function next() which will cause the generator function to

resume its execution until the next yield expression is

found. After the next yield expression is found, the

function will pause execution again.

(next(standing_values))

When a generator calls yield, it is momentarily passing

the control back to the code looping over generator values.

In a foor loop you pass control to the generator which

yields a value back to you.

This process goes back and forth back and forth until

the generator has run out of yields.