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Python for Everyone, 3rd Edition

How to Tell which Printing You Have

On the copyright page (facing the first page of the Preface), there is a printing history of the book. The printing history is a row of numbers that—at the 1st printing—looks like this:

10 9 8 7 6 5 4 3 2 1

At each subsequent printing, one number is removed from the end of this row of numbers to indicate which printing of the book you have. For example, the last number in the row of numbers in the 2nd printing is 2, and so on. In the list below, [n] means that an error is fixed in the nth printing.

Chapter 4 Table 1

In the second example, change

total = total - 1

to

total = total - i

Chapter 5 Exercise R5.9

Add this line to the end of the g function below line 21:

   return b

The entire program should read:

a = 0
b = 5
  
def main() :
   global a
   global b
   i = 10
   b = g(i)
   print(a + b + i)
  
def f(i) :
   n = 0
   while n * n <= i :
      n = n + 1
   return n - 1

def g(a) :
   b = 0
   for n in range(a) :
      i = f(n)
      b = b + i 
   return b

main()

Chapter 5 Exercise P5.43

Replace “Supply a button that, when clicked, produces the next iteration.” with “Write a turtle graphics program that draws the iterations of the snowflake shape.”

Chapter 6 Section 6.7.1

Add a comma behind the second-to-last row of the counts table:

counts = [
      [ 0, 3, 0 ],
      [ 0, 0, 1 ],
      [ 0, 0, 1 ],
      [ 1, 0, 0 ],
      [ 0, 0, 1 ],
      [ 3, 1, 1 ],
      [ 0, 1, 0 ],
      [ 1, 0, 1 ]
   ]

Chapter 7 Section 7.3 cipher.py

Change

if offset > LETTERS :

to

if offset >= LETTERS :

Chapter 7 Toolbox 7.3

Change

"http://horstmann.com/index.html"            

to

"http://horstmann.com/python4everyone/sample.html"

(Why the change? As it happens, page at the former URL uses single quotes for images—see Exercise P7.49.)

VitalSource Chapter 12 Section 2 Self Check Exercise 2

Change the choices to:

• T = 0.9 (n / 1000)
• T = 0.9 (n / 1000)²
• T = 0.09 (n / 1000)²
• T = 0.09 (n / 1000)³

VitalSource Chapter 12 Section 2 Practice 12.2 Exercise 1

Change the question to: “Given the data in Figure 1, approximately how long would it take to sort an array with 120,000 elements?” and the choices to:

• Less than 10 minutes
• About 11 minutes
• About 15 minutes
• Over 20 minutes

VitalSource Chapter 12 Practice 12.2 Self Check Exercise 2

Change the question to: “Given the data from the preceding exercise, approximately how many minutes would it take to sort an array with 300,000 elements?”

Glossary entry for Unicode

Change the entry to: “A standard code that assigns code values to characters used in scripts around the world.”

Thanks to Sandro Doro, Minglu Gu, MingShan Su, Ben Stephenson, Virginia Tice, and (your name might go here) for their bug reports and suggestions

Bug Report Form

Please use this form to report any bugs that you find. Please check the list of known bugs first before you report a bug. Unfortunately,we do not have the time to respond personally to every report, but we do read them all and will post updates to this page. Thank you!