old_contents: __all__ = ['identity', 'print_generated_sequence']
  
  
  def identity(x):
      """
      Helper function which returns its argument unchanged.
      That is, `identity(x)` returns `x` for any input `x`.
      """
      return x
  
  
  def print_generated_sequence(gen, num, *, sep=", ", seed=None):
      """
      Helper function which prints a sequence of `num` items
      produced by the random generator `gen`.
      """
      if seed:
         gen.reset(seed)
  
      elems = [str(next(gen)) for _ in range(num)]
      sep_initial = "\n\n" if '\n' in sep else " "
      print("Generated sequence:{}{}".format(sep_initial, sep.join(elems)))
new_contents: from collections import namedtuple
  
  __all__ = ['identity', 'print_generated_sequence']
  
  
  def identity(x):
      """
      Helper function which returns its argument unchanged.
      That is, `identity(x)` returns `x` for any input `x`.
      """
      return x
  
  
  def print_generated_sequence(gen, num, *, sep=", ", seed=None):
      """
      Helper function which prints a sequence of `num` items
      produced by the random generator `gen`.
      """
      if seed:
         gen.reset(seed)
  
      elems = [str(next(gen)) for _ in range(num)]
      sep_initial = "\n\n" if '\n' in sep else " "
      print("Generated sequence:{}{}".format(sep_initial, sep.join(elems)))
  
  
  def make_dummy_tuples(chars='abcde'):
      Quux = namedtuple('Quux', ['x', 'y'])
      some_tuples = [Quux((c*2).upper(), c*2) for c in chars]
      return some_tuples
  
subject: Add helper function to produce some dummy tuples (for testing and debugging)