Code Python:

I have received your answer, but I still do not understand the difference between $\%$ and $//,$ and when I use $\%$ and $//$ and why xn is using $\%$ and why xy is $//,$ can you please help and explain, thanks a lot!

Write a program that performs a circular permutation of given shift in a text box.

The answer that I do not understand the rectangle part, can you please kindly help me here?

$```$

p$1=$ Picture$("$ImagesPython$/$HarryPotter$.$jpg$")$

p$2=$ copy$($p$1)$

i$1=$ Entry$($width$=10)$

b$1=$ Button$($width$=10)$

borneX, borneY $=$ p$1.$width$(),$ p$1.$height$()$

nbPixels $=$ borneX $*$ borneY

def b$1\_$click$()$ :

decalage $=$ int$($il$.$get$())$

for x in range$($borneX$)$ :

for y in range$($borneY$)$ :

coul $=$ RGB$(*$getRGB$($p$1,$ x$,$ y$))$

nb $=$ int$($borneX $*$ y $+$ x $+$ decalage$)\%$nbPixels

xn $=$ nb $\%$ borneX

yn$\}=\backslash$textrm$\{$nb $//$ borneX

pixel$($p$2,$ xn$,$ yn$,$ coul$)$

$```$

Your reply is below and I still do not understand the difference between $\backslash (\backslash \%\backslash )$ and $\backslash (/\backslash$underline$\{\backslash$underline$\{/\}\}\backslash ),$ when do we use them? Why to use $\backslash \%$ in xn and why to use $//$ in yn $?$ Pixel Shift Calculation:

$```$

nb $=$ int$($borneX $*$ y $+$ x $+$ decalage$)\%$ nbPixels

xn $=$ nb $\%$ borneX

yn $=$ nb $//$ borneX

$```$

$1$st step:

$1.$ nb: Calculates a new "shifted" index for each pixel by combining its original position $(\backslash ($ x$,$ y $\backslash ))$ with the decalage.

$2.\backslash \%$ nbPixels: Ensures the index wraps around the image size, creating a circular effect.

$3.\backslash ($ x n $\backslash )$ and $\backslash ($ y n $\backslash )$ : Convert the $1$D index nb back into $2$D coordinates $(\backslash ($ x n$,\backslash$mathrm$\{$yn$\}\backslash ))$ to place each pixel at its new position.