First Edition Errata

• p83 - The example output shown at the top of the page is incorrect from the lines:

  year = 2021
  month = 1
  day = 20
  print("Today is", year, month, day, sep="/")
  

  The output is actually:

  Today is/2021/1/20

  This is actually not the desired output. A better solution would be:

  print("Today is: ", end="")
  print(year, month, day, sep="/")
  

  (thanks to Jeremy Zhang)
• p211 - Exercise 3.6, quadratic, lists two examples of equations and their roots. Due to a formatting error, the equations listed are incorrect. They should be:
  • x² - 7x + 12: x = 4, x = 3
  • x² + 3x + 2: x = -1, x = -2
  (thanks to Jonathan Koppelman)
• p508 - the line of code:

  lis.insert(lis[i])

  should be:

  lis.append(lis[i])

• p513 - the list shown is missing a closing ] brace. It should be: [36, 12, 25, 19, 46, 31, 22]
• p556 - The first sentence at the top of the page should read, "What keys and values are contained in the following map dictionary after this code executes?"
• p558 - In Self-Check 8.12 part (c), the word "kwyjiby" should be "kwyjibo".
• p559 - In Self-Check 8.19, the problem lists several sets named people, male, female, young, old, silly, and hungry. There should also be sets named rich and poor.
• p629 - In Self-Check 9.14, the code should call fibonacci rather than fib. The complete code should be:

  def fibonacci(n):
  	if n <= 2:
  		return 1
  	else:
  		return fibonacci(n - 1) + fibonacci(n - 2)
  

• p704 - In the code listing on line 16, the if test is incorrect. Its <= operator should be < . The line of code should be:

  if self.day < self.days_in_month():
  

• p720 - In the code listing on line 42, the if test is incorrect. Its <= operator should be < . The line of code should be:

  if self.day < self.days_in_month():
  

• p732 - Self-Check 11.8 refers to a compute_interest method; the heading shown is incorrect. It should be:

  def compute_interest(self, rate)

• p733 - Exercise 11.2 refers to the from_absolute_day method as an accessor. It should be referred to as a mutator method, since it modifies the Date object.
• p783 - Exercise 12.4 lists the wrong formula for the area of a circle. It should be: π r².

Reporting Errors:

Have you found an error in our textbook? If so, please email us at:

authors AT buildingpythonprograms DOT com