🔒 hw help

[torpid ivy]

Hey, I was wondering how exactly this code worked for this problem? I was trying to make a while loop using variables so the first letter would move back to the last, then the second would move to the first and vice versa but that loop didn't work out. So I got this code from a friend who did the question but I couldn't understand how their code works

[potent echo]

@torpid ivy

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[torpid ivy]

If you guys could, I would also love to know how to make a loop work for this

I was doing something like this, this is obviously incomplete but I wasn't sure how to go ahead with this

[cosmic jungle]

I'm typing out the originals so it's easier to talk about them, OK?

def cycle(input_list):
  tmp = input_list[0]
  length = len(input_list)
  for i in range(length-1):
    input_list[i] = input_list[i+1]
  input_list[-1] = tmp

[torpid ivy]

ok

[cosmic jungle]

the way this works is that it first saves the first item in the list in a temp variable (tmp = input_list[0])

then it loops through the numbers 0 through the last index of the list

and for each, it takes the next list item and puts it in the current one

[torpid ivy]

oh wait

i was thinking of it wrong

[cosmic jungle]

so when i is 1, it takes the value in input_list[2] and puts it in input_list[1]

[torpid ivy]

i thought it took the first item and moved it to the second

it makes so much more sense now

thanks

why is there an index error for this

[night sky]

when b = 4, it’s at the last index of the list

but you compared it with input_list[b+1]

so it’s comparing with a number outside of the list

so index error

[torpid ivy]

o ye, so it needs to be less than length - 1

thanks

[potent echo]

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