Shifting python list and showing on screen

[TellerFarsight]

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default unit_list = ["A", "B", "C"]

screen show_the_list:
    vbox:
        text "First, there's" + unit_list[0]
        text "Then, there's" + unit_list[1]
        text "And finally, there's" + unit_list[2]

I'm actually doing it with images, but I think it should work the same. This part works fine, but what I want to do is manipulate unit_list and then show it on the screen.
I can put a line:

Code: Select all

$ unit_list = ["B", "C", "A"]

and it shifts everything, but I want to make this somewhat automatic, with something like

Code: Select all

$ unit_list.insert(0, unit_list.pop)

maybe that's the problem, but if it's this or something else, trying

Code: Select all

$ unit_list.insert(0, unit_list.pop)
pause
show screen show_the_list

returns the error
"coercing to Unicode: need string or buffer, instancemethod found

[philat]

Some variation on modulo should work. Not particularly refined here, but you get the basic idea.

Code: Select all

default unit_list = ["A", "B", "C"]

screen show_the_list(turn):
    vbox:
        text "First, there's" + unit_list[turn % 3]
        text "Then, there's" + unit_list[(turn+1) % 3]
        text "And finally, there's" + unit_list[(turn+2) % 3]
        
label start:
    show screen show_the_list(1)
    pause
    show screen show_the_list(2)
    pause

[TellerFarsight]

That looks like it would work, but I did figure out another solution.
Whenever I want it to change, I just put

Code: Select all

$ unit_list = unit_list[1:] + unit_list[:1]

If you need to do this kind of thing *without* altering the actual list at all, your solution would be good.

[Remix]

You list.insert, list.pop version should work if you actually call pop ( with the .pop() calling parenthesis )

a.insert( 0, a.pop() )
a = [ a.pop() ] + a
a = a[-1:] + a[:-1]

[TellerFarsight]

Right. I was told initially that if I list.pop without specifying an index, it would just take the last one, but because of that I forgot to put parentheses at all.