Table of Contents
[ ii ]
Hard to explain, easy to explain 25
Namespaces are one honking great idea 25
Conclusion 26
Explaining PEP8 27
Duck typing 27
Differences between value and identity comparisons 29
Loops 30
Maximum line length 31
Verifying code quality, pep8, pyakes, and more 32
ake8 32
Pylint 35
Common pitfalls 35
Scope matters! 36
Function arguments 36
Class properties 37
Modifying variables in the global scope 38
Overwriting and/or creating extra built-ins 39
Modifying while iterating 41
Catching exceptions – differences between Python 2 and 3 42
Late binding – be careful with closures 44
Circular imports 45
Import collisions 47
Summary 48
Chapter 3: Containers and Collections – Storing Data the
Right Way 49
Time complexity – the big O notation 50
Core collections 51
list – a mutable list of items 52
dict – unsorted but a fast map of items 55
set – like a dict without values 57
tuple – the immutable list 59
Advanced collections 62
ChainMap – the list of dictionaries 62
counter – keeping track of the most occurring elements 64
deque – the double ended queue 66
defaultdict – dictionary with a default value 68
namedtuple – tuples with eld names 71
enum – a group of constants 72
OrderedDict – a dictionary where the insertion order matters 74
heapq – the ordered list 75
bisect – the sorted list 76
Summary 79
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