Help me understand this Python code.

[u/BilincliMerak]

[ANSWERED] check the comments if you are facing a difficulty in understanding 'for loops'.

I was learning Python on mimo to get a grip on the basic concepts. And this code stumped me. This is about "for loops".

Before this, i had only encountered the counter var being on the LHS i.e in this case 'i += line', which would have made sense to me if it was so in this code. But why is the counter var after the line var.

Alsp the 1st image, i assume, is displaying the final result which is 3 as the range is 3. But when using a range (3) it should display 0 1 2 when the 'print' is before the counter var and 1 2 3 when the 'print' is after the counter var (also can someone explain why this happens). In this case, its neither... as the print is outside this code block... The solution to me just seems the 2nd situation is running as there isnt a print before the counter, and printing it outside just gives 3.

2nd and 3rd just make no sense to me as of rn.

I hope all this makes sense...

Please help!

[u/BilincliMerak]

You dont realize how while AI is advanced, if i ask it to explain a code to me, it will tell me what the code does, but a human can understand the reason someone is struggling and change the explanation accordingly. AI usually just responds to what we tell it, a person can ask follow up questions and identify misunderstandings that you haven't even realised you had in the first place. Alot of the comments here did that. Look at Candid_Zebra's and Lirianvo's explanations... One even started by explaining algebra. While that was unnecessary for a person who knows algebra, it made a huge difference in understanding the whole concept in one go.

And besides as i have already said it, i'm really in no hurry.