Exploring Python--Errata
Fall 2009, David Matuszek

This file will be updated whenever more corrections are found.

Page Correction
4
 Ctrl-D and Ctrl-Z don't work to halt program execution; use Ctrl-C instead.
14
Change: print "answer is," eval(expr)
To: print "answer is", eval(expr)
The comma should be outside the quotes.
51
 The last four lines of triType need to be indented more, so that elif and else are directly below the first if.
60, problem 9
(a * a)n/2 should be (a * a)n/2
65
 In the program at the bottom of the page, the word chapter accidentally wrapped to the next line. It's part of the comment, so it should be on the previous line.
66
 The variable std and the function std should have different names.
67
 There are two problems in the first join example. There is an essential period missing (perido is an operator), and the result should have spaces between the letters.
Change: ' 'join(['x', 'y', 'z'])
'xyz'
To: ' '.join(['x', 'y', 'z'])
'x y z'
69
 Just below the box, the line
[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]] should be
[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 7, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
71, line 3
[1, 2, 3] should be [1, 7, 3]
101, second program
Incorrect code : print line.capwords()
One possible fix: print line.title()
Another possible fix: import string   # as first line of program
print string.capwords(line)
The methods title and capwords are called differently, but do almost the same thing.
116
 Incorrect results are shown at the top of the page.
Change: >>> print myAccount.getBalance()
200
>>> print newAccount.getBalance()
300
To: >>> print myAccount.getBalance()
300
>>> print newAccount.getBalance()
300
145
 The result of the expression 3 4 2 + * is 18, not 24.
155
 Inconsistent capitalization: aFun() should be afun(), or vice versa.