use python and write down explanations

3. Write a program that reads and displays the attached image in matlab or python. Convert the image to grayscale and typecast it from an integer format to an array of floating-point (double precision) values. Normalize the image (shift the pixels values to range from 0-1) and display it in black and white. Plot the pixel histogram before and after squaring all of the pixel values (a type of contrast stretching')