Lee Vaughan - Impractical Python Projects (2018) - Errata and Updates.pdf

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Impractical Python Projects
Playful Programming Activities to Make You Smarter
by Lee Vaughan
November 2018, 424 pp.
ISBN-13:
9781593278908
Updates
Page 79:
code output at bottom of page is based on Figure 4-3, not Figure 4-2.
Page 100:
The output printout near the bottom of page that reads:
Panel at east end of chapel slides
Should instead read:
Panelateastendofchapelslides
Page 103:
The cipher example that reads:
The cold tea didn’t please the old finicky woman.
Should instead read:
So, the cold tea didn’t please the old finicky woman.
Page 141:
Wingding 7 and the preceding line in Listing 7-10 that read:
lock_wheel = int(randrange(0, len(combo)))
next_try[lock_wheel] = randint(0, len(combo)-1)
Should instead read:
lock_wheel = randrange(0, len(combo))
next_try[lock_wheel] = randint(0, 9)
Page 205:
The line and following equation that read:
The transformation to generate points over a
unit
disc is as follows:
x= √r*cos
Should instead read as:
The transformation to generate points
evenly
over a
unit
disc is:
x= √r*cosθ
And the line that reads:
The equations yield (x,
y)
values between 0 and 1.
Should instead read as:
The equations yield (x,
y)
values between -1 and 1.
Page 218:
Indentation for the listing on the page should be as follows:
>>>
>>>
>>>
>>>
from random import randint
trials = 100000
success = 0
for trial in range(trials):
faces = set()
for rolls in range(6):
roll = randint(1, 6)
faces.add(roll)
if len(faces) == 6:
success += 1
>>> print("probability of success = {}".format(success/trials))
probability of success = 0.01528
Page 250:
Listing 12-1 should read as:
import sys
import random
import matplotlib.pyplot as plt
def read_to_list(file_name):
"""Open a file of data in percent, convert to decimal & return a list."""
with open(file_name) as in_file:
lines = [float(line.strip()) for line in in_file]
decimal = [round(line / 100, 5) for line in lines]
return decimal
def default_input(prompt, default=None):
"""Allow use of default values in input"""
prompt = '{} [{}]: '.format(prompt, default)
response = input(prompt)
if not response and default:
return default
else:
return response
Page 252:
The last line on page that reads:
Set the default to
'sbc_blend',
since this is theoretically the most stable mix of the four choices.
Should instead read as:
Set the default to
'bonds',
in order to see how this supposedly “safe” choice performs.
Page 259:
The first line in last paragraph that reads:
Let’s work an example that assumes a starting value of $2,000,000, a “safe and secure” bond portfolio, a 4
percent withdrawal rate (equal to $80,000 per year), a 30-year retirement, and 50,000 cases.
Should instead read as:
Let’s work an example that assumes a starting value of $2,000,000, a “safe and secure” bond portfolio, a 4
percent withdrawal rate (equal to $80,000 per year), a 29-30-31 retirement range, and 50,000 cases.
Page 261:
The last two lines in Listing 12-9 that read:
investments -= withdraw_infl_adj
investments = int(investments * (1 + i))
Should instead read as:
investments -= withdraw_infl_adj
investments = int(investments * (1 + i))
Page 305:
In the last paragraph,
transform_rotate()
should be
transform.rotate()
Page 356:
Between wingdings 5 and 6, Listing 16-2 should read as:
# check for missing digits
keys = [str(digit) for digit in range(1, 10)]
for key in keys:
if key not in first_digits:
first_digits[key] = 0

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