To complete this task, the programme needs to keep asking the user to input numbers, until they average or quit # this line initally takes in the input of the user number = input("Enter a number (input 'a' to average and 'q' to quit):") # the user inputted numbers need to be stored together in an array # an empty array is initialised for this purpose nums = [] # if the number is not 'a' (meaning take an average) and not 'q' for quit, the while loop is entered # this while loop continues asking for input and storing it until the user either asks for the average or quits while (number != 'a') and (number != 'q'):  #  the user input is stored in the array  nums.append(float(number))  #  ask for another input  number = input("Enter a number (input 'a' to average and 'q' to quit):") # if the user inputs a or q, the programme comes out of the while loop and is here # if the user inputs a the average is computed if number == 'a':  #  an edge case if no numbers have been inputted so far  if nums == []:    print('You have not inputted any numbers yet, please start the programme again')  #  if numbers have been inputted - calculate mean  else:    #  calculate the mean, do total/length of the array    total = sum(nums)    length = len(nums)    average = total/length    print ("average: ", round(average,2)) # else, if q was entered, quit elif number == 'q':  print ('You have quit the programme')