Step by Step solution about How to resolve the algorithm Greyscale bars/Display step by step in the Python programming language

The given Python 2.7.1 code generates a vertical image of four gray-scaled stripes, each with different widths.

The code begins by importing the livewires module and setting up the graphics window with a black background.

The ty_pruhy function is defined to draw a single stripe. It takes three arguments: an index representing the stripe's position, the stripe's width, and a boolean value indicating whether the stripe should be drawn from left to right.

Within the ty_pruhy function, the stripe's height and lower y-coordinate are calculated. Then, the stripe's width is divided into equal intervals, and a color is assigned to each interval based on the stripe's width. The stripe is drawn using a loop, where each iteration draws a horizontal rectangle with the appropriate color and coordinates.

The main section of the code creates a list of four sublists, each representing one stripe. The first element in each sublist is an index representing the stripe's position, the second element is the stripe's width, and the third element is a boolean value indicating whether the stripe should be drawn from left to right.

The loop in the main section iterates through each stripe in the list, calling the ty_pruhy function to draw the stripe.

Finally, the code enters a loop that waits until the spacebar is pressed to close the graphics window.

#!/usr/bin/env python
#four gray scaled stripes 8:16:32:64 in Python 2.7.1

from livewires import *

horiz=640; vert=480; pruh=vert/4; dpp=255.0
begin_graphics(width=horiz,height=vert,title="Gray stripes",background=Colour.black)

def ty_pruhy(each):
	hiy=each[0]*pruh; loy=hiy-pruh
	krok=horiz/each[1]; piecol=255.0/(each[1]-1)
	for x in xrange(0,each[1]):
		barva=Colour(piecol*x/dpp,piecol*x/dpp,piecol*x/dpp ); set_colour(barva)
		if each[2]:
			box(x*krok,hiy,x*krok+krok,loy,filled=1)
		else:
			box(horiz-x*krok,hiy,horiz-((x+1)*krok),loy,filled=1)

# main
source=[[4,8,True],[3,16,False],[2,32,True],[1,64,False]]
for each in source:
	ty_pruhy(each)

while keys_pressed() != [' ']: # press spacebar to close window
	pass