text: numbers = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
  letters = ('a', 'b', 'c', 'd')
  
  # slicing of tuples
  print(numbers[2:5])
  even_nums = numbers[1::2]
  odd_nums = numbers[0::2]
  print('even numbers', even_nums)
  print('odd numbers', odd_nums)
  
  # iteration with tuples
  for n in numbers:
      print(n ** 2)
  
  
  # functions with tuples
  def area_and_circumference_of_circle(radius):
      import math
      return (math.pi * radius ** 2, 2 * math.pi * radius)
  
  
  print(area_and_circumference_of_circle(9))
  # common errors with tuples (assignment, iteration)
  letters = letters + 'e'