text: # sum of first 5 nums
  sum = 0
  Max = 5
  
  for number in range(Max):
      number = float(input("enter a number: "))
      sum += number
      
  print(sum)
  
  # indexed loops
  vals = [3, 15, 17, 7]
  result = 0
  for x in vals:
      result += x
  print(result)
  
  # += -= *= .= %=
  
  # getscore
  score = float(input("Please enter your score: "))
  while score < 0:
      print("There is an error, please enter a positive number")
      score = float(input("Please enter your score: "))
  print(score)
  
  # practice
  
  # nums = ''
  # for num in range(99, 89, -1):  # 99-90 (inclusive) decrement by 1
  #    nums += str(num) + ", "  # append comma to string
  # print(nums[:-2])  # remove last comma and space from string
  
  for num in range(99, 89, -1):
      print(num, end=", ")  # by default end is newline