apress / beginning-python-3ed

Source code for 'Beginning Python' by Magnus Lie Hetland

#Apress Source Code

This repository accompanies Beginning Python by Magnus Lie Hetland (Apress, 2017).

Download the files as a zip using the green button, or clone the repository to your machine using Git.

##Releases

Release v1.0 corresponds to the code in the published book, without corrections or updates.

##Contributions

See the file Contributing.md for more information on how you can contribute to this repository.

beginning-python-3ed's Issues

page 154 chapter 8

Since the program on page 151 is like so:

try: 
    x = int(input('Enter the first number: '))
    y = int(input('Enter the second number: '))
    print(x / y)
except ZeroDivisionError:
    print("The second number can't be zero!")

we will not get the :
TypeError: unsupported operand type(s) for /: 'int' and 'str'
if we give a "hello world!" as a 2nd number. Instead we will get that the typed input cannot be converted to int.
ValueError: invalid literal for int() with base 10: '"hello world!"

So the code on page 155 should be

try:
    x = int(input('Enter the first number: '))
    y = int(input('Enter the second number: '))
    print(x / y)
except ZeroDivisionError:
    print("The second number can't be zero!")
except ValueError:
    print("Are you sure you typed an integer?")

Indentation errors on Chapter20/listing20-6.py

line 26 " for rule in self.rules: '" should forward indent, aligned with "for filter in self.filters:"

TypeError raised on Chapter 14/listing14-1.py

Socket methods such as .send expect a bytes object as the data to be sent, not a string object. So in line 13 , c.send(b'Thank you for connecting') bytes is needed.

Python

chapter 20, Second implementation : each block is repeated 3 times

Hi, I have tried to reproduce project from chapter 20, but it tripples each block. See screenshot.

page 99 error (chapter 5 , just a small typo)

In the summary the line :
xrange([start,] stop[, step]) Creates an xrange object, used for iteration
should be :
range([start,] stop[, step]) Creates a range object, used for iteration

page 17 error

At the end of the page :
print("Hello, \ world!")
I am sure that the author wants to write :
print("Hello,
world!")

The 'Chapter24/listing24-6.py' has some error when connecting

When I connect to the socket,it always complain.
AttributeError, ChatSession instance has no attribute 'room'

page 43 (Chapter 2 , this seems serious technical error on methods of tuples)

At the end of the page 43 this is mentioned :
(unless you need methods such as index and count, which tuples don’t have)

But I created a tuple and I could call those 2 methods ( i have Python 3.6):
>>> mynumtuple = (10,20,30)
>>> len(mynumtuple)
3
>>> mynumtuple.index(30)
2

page 126 error (chapter 6)

That is an easy one:
`
>>> filter(lambda x: x.isalnum(), seq)

['foo', 'x41']
`

should be corrected to

`
>>> list(filter(lambda x: x.isalnum(), seq))

['foo', 'x41']
`

Book errata（on page 81)

x = [1, 2, 3]
>>> y = [2, 4]
x is not y

should be：

x = [1, 2, 3]
>>> y = [2, 1]
x is not y

page 64 error (chapter 4)

x = {}
y = x
x['key'] = 'value'
y
{'key': 'value'}
x = {}
x = {} #### This is wrong!
{'key': 'value'}

The final line should be :

y
{'key': 'value'}

(e)Book errata

Somehow i couldn't find the errata link to the book, neither on Apress nor Springer, so i'm posting it here.
Maybe others will stumble upon it in search for answers (and/or maybe provide their findings).

Page 5 - Octal number literals: the book claims that octal number literals can be written as >>> 010. On execution, you will be presented with an SyntaxError: invalid token error.
PEP 3127 -- Integer Literal Support and Syntax from 2007-05-14 proposes that it should contain an additional o or O between the 0 and the octal number (similar to binary with 0b and hexadecimal with 0xprefix), therefore resulting in 0o10 or 0O10. This has been proposed for Python 3.0, and for backward compatibility, to Python 2.6.