Errata

This page is used to list and correct known errors in Hello World! Computer Programming for Kids and Other Beginners. We apologize for any inconvenience.

 

Errata from the Fourth Corrected Printing:

Page 95

At the end of the fourth paragraph, add the following: 

Note that when you see __init__ in the code, there are two underscores on either side of 'init'.
	That's two underscores before and two underscores after,  not just one on either side.

Page 111

The code for Question 3 of the "Test yOur knowledge" section should read as follows: 

for i in range(5):
    for j in range(3):
        print '*',
    print

Page 152

At the end of the first paragraph (right before the Carter Says), add the following:

It's a little hard to see, but there are two underscores on either side of the 'init'. 
	That's a total of 4 underscores, two on either side.

Page 153

At the end of the fifth paragraph (just before the heading 'What's "self"?', add the sentence: 

"All the "magic" methods use two underscores before and two underscores after the name of the method.

Page 161

In the code snippet at the bottom of the page, the line 

GameObject.__init__(self)
should be 
GameObject.__init__(self, "coin")

Page 339

In listing 24.1, in line 10, there is an 'A' at the end of the line

ship_mass = 5000.0

The 'A' should not be there.

Page 385

Answer to Question #5, Chapter 18, should be pygame.USEREVENT instead of pygame.NUMEVENTS

 

Errata from the Second and Third Corrected Printings:

Page 11, Listing 1.2

The second line should read: 

secret = random.randint(1, 99)

Page 35

The e-notation graphic 

		0.00000000000011752 = 1.752e-13
should be 
		0.0000000000001752 = 1.752e-13
(an extra '1' was added in typesetting)

Page 48

The sentence: 

 "Even if the user enters a float, it will get rounded down (chopped off) to an integer."
should be deleted.

Page 59, Listing 6.5

The second line should read: 

secret = random.randint(1, 99)

Page 74

The second bullet should read, 

"those that repeat until a certain thing happens—these are called 
conditional loops because they keep going as long as some condition is true"

Page 95

At the end of the fourth paragraph, add the following: 

Note that when you see __init__ in the code, there are two underscores on either side of 'init'.
	That's two underscores before and two underscores after,  not just one on either side.

Page 111

The code for Question 3 of the "Test yOur knowledge" section should read as follows: 

for i in range(5):
    for j in range(3):
        print '*',
    print

Page 119

4th paragraph, the 2nd sentence should read 

"A list has square brackets, so for extend(), you could have both round and square brackets."

Page 152

At the end of the first paragraph (right before the Carter Says), add the following:

It's a little hard to see, but there are two underscores on either side of the 'init'. 
	That's a total of 4 underscores, two on either side.

Page 153

At the end of the fifth paragraph (just before the heading 'What's "self"?', add the sentence: 

"All the "magic" methods use two underscores before and two underscores after the name of the method.

Page 161

In the code snippet at the bottom of the page, the line 

GameObject.__init__(self)
should be 
GameObject.__init__(self, "coin")

Page 339

In listing 24.1, in line 10, there is an 'A' at the end of the line

ship_mass = 5000.0

The 'A' should not be there.

Page 385

Answer to Question #5, Chapter 18, should be pygame.USEREVENT instead of pygame.NUMEVENTS