new_contents: # Chapter 12 Practice Questions
  
  # 1. What does this expression evaluate to?
  expression = '    Hello world'.strip()
  print(expression)
  
  # 2. Which characters are whitespace characters?
  print(" \t\n")
  
  # 3. Why does 'Hello world'.strip('o') evaluate to a string that still has Os
  #    in it?
  expression = 'Hello world'.strip('o')
  print(expression)
  expression = 'oooHello worldooo'.strip('o')
  print(expression)
  
  # 4. Why does 'xxxHelloxxx'.strip('X') evaluate to a string that still has Xs
  #    in it?
  expression = 'xxxHelloxxx'.strip('X')
  print(expression)
  expression = 'XXXHelloXXX'.strip('X')
  print(expression)
  
subject: Initialize PracticeQuestions