Help me with this Python program please. Only this question have been given. Maybe any answer relate to the question.

Design a program that read any unknown number of exam scores from a Programming Test which have been kept in a file, calculate the class average and redisplay all the scores and the average score to the screen. The program should be able to only receive exam scores between 0 and 100 only and will terminate when the score entered is 999. Keep the scores in an array. a. Produce the Defining Diagram. b. Develop the pseudocode. Do NOT use the counted loop in your design. Use both the leading (pretest) and trailing (posttest) decision for the required loops