FAQ: Learn Python: Loops - Infinite Loops

This community-built FAQ covers the “Infinite Loops” exercise from the lesson “Learn Python: Loops”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Computer Science
Data Science

FAQs on the exercise Infinite Loops

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6 posts were split to a new topic: Why isn’t one of my lists being printed?

3 posts were split to a new topic: This was my solution

3 posts were split to a new topic: What can the iteration variable be named?

6 posts were split to a new topic: How can I advance the exercise after the infinite loop?

I’m having trouble understanding the syntax for this exercise.

my_favorite_numbers = [4, 8, 15, 16, 42]

for number in my_favorite_numbers:
my_favorite_numbers.append(1)

Does this mean that every time the loop runs, the number one is added to the list? (4, 8, 15, 16, 42, 1, 1, 1…)

Yes, you are correct, and because the number 1 is added each time the for is running, the for will never end because there will be always a new number.

!!! Anyway, I’ve got another problem with exercise 3 from ’ Infinite Loops’ lesson. I have to create an infinite loop here, which I did but after I hit the run button the page is freezing and I have to refresh the page. When the page has been refreshed the exercise 3 is not checked as done, so I’m actually stuck here. Any idea how to skip this one ?

Thanks

my_favorite_numbers = [4, 8, 15, 16, 42]

for number in my_favorite_numbers:
print(number)

If I write my code like this, the numbers on the list 4, 8, 15, 16,42 will be printed out.

my_favorite_numbers = [4, 8, 15, 16, 42]

for number in my_favorite_numbers:
my_favorite_numbers.append(1)

However, I do not get why this is an infinite loop. Doesn’t append mean to just add a number. So would it not print 4, 8, 15, 16, 42,1. Why does the loop continuously go on?

Why doesn’t the following code work as a solution?

for student in students_in_period_A:
return students_in_period_B.append(student)

?

I have figured out that if you remove the return, the code works. I would like to understand why?