can we define layout_width of layout_height for shape android code example

Example 1: what does function setup() do in javascript

function setup() {
	create canvas(400, 400)
}

function draw(){
	if(mouseIsPressed){
		fill(0);
}else{
  fill(255)
}
  ellipse(mouseX, mouseY, 80, 80)
}

Example 2: for i in a for j in a loop python

for i, j in zip(range(x), range(y)):
  ...