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	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#130using-default-dictionaries-to-represent-simple-trees
https://gist.github.com/hrldcpr/2012250	https://gist.github.com/hrldcpr/2012250
	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#131mapping-objects-to-unique-counting-numbers-collectionsdefaultdict
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	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#133cartesian-products-itertoolsproduct
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	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#2table-of-contents
1 Introduction	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#introduction
1.1 Unpacking	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#unpacking
1.2 Unpacking for swapping variables	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#unpacking-for-swapping-variables
1.3 Extended unpacking (Python 3 only)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#extended-unpacking-python-3-only
1.4 Negative indexing	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#negative-indexing
1.5 List slices (a[start:end])	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#list-slices-a-start-end
1.6 List slices with negative indexing	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#list-slices-with-negative-indexing
1.7 List slices with step (a[start:end:step])	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#list-slices-with-step-a-start-end-step
1.8 List slices with negative step	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#list-slices-with-negative-step
1.9 List slice assignment	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#list-slice-assignment
1.10 Naming slices (slice(start, end, step))	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#naming-slices-slice-start-end-step
1.11 Iterating over list index and value pairs (enumerate)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#iterating-over-list-index-and-value-pairs-enumerate
1.12 Iterating over dictionary key and value pairs (dict.iteritems)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#iterating-over-dictionary-key-and-value-pairs-dict-iteritems
1.13 Zipping and unzipping lists and iterables	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#zipping-and-unzipping-lists-and-iterables
1.14 Grouping adjacent list items using zip	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#grouping-adjacent-list-items-using-zip
1.15 Sliding windows (n-grams) using zip and iterators	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#sliding-windows-n-grams-using-zip-and-iterators
1.16 Inverting a dictionary using zip	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#inverting-a-dictionary-using-zip
1.17 Flattening lists:	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#flattening-lists
1.18 Generator expressions	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#generator-expressions
1.19 Dictionary comprehensions	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#dictionary-comprehensions
1.20 Inverting a dictionary using a dictionary comprehension	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#inverting-a-dictionary-using-a-dictionary-comprehension
1.21 Named tuples (collections.namedtuple)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#named-tuples-collections-namedtuple
1.22 Inheriting from named tuples:	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#inheriting-from-named-tuples
1.23 Sets and set operations	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#sets-and-set-operations
1.24 Multisets and multiset operations (collections.Counter)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#multisets-and-multiset-operations-collections-counter
1.25 Most common elements in an iterable (collections.Counter)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#most-common-elements-in-an-iterable-collections-counter
1.26 Double-ended queue (collections.deque)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#double-ended-queue-collections-deque
1.27 Double-ended queue with maximum length (collections.deque)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#double-ended-queue-with-maximum-length-collections-deque
1.28 Ordered dictionaries (collections.OrderedDict)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#ordered-dictionaries-collections-ordereddict
1.29 Default dictionaries (collections.defaultdict)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#default-dictionaries-collections-defaultdict
1.30 Using default dictionaries to represent simple trees	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#using-default-dictionaries-to-represent-simple-trees
1.31 Mapping objects to unique counting numbers (collections.defaultdict)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#mapping-objects-to-unique-counting-numbers-collections-defaultdict
1.32 Largest and smallest elements (heapq.nlargest and heapq.nsmallest)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#largest-and-smallest-elements-heapq-nlargest-and-heapq-nsmallest
1.33 Cartesian products (itertools.product)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#cartesian-products-itertools-product
1.34 Combinations and combinations with replacement (itertools.combinations and itertools.combinations_with_replacement)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#combinations-and-combinations-with-replacement-itertools-combinations-and-itertools-combinations-with-replacement
1.35 Permutations (itertools.permutations)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#permutations-itertools-permutations
1.36 Chaining iterables (itertools.chain)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#chaining-iterables-itertools-chain
1.37 Grouping rows by a given key (itertools.groupby)	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#grouping-rows-by-a-given-key-itertools-groupby
1.38 Start a static HTTP server in any directory	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#start-a-static-http-server-in-any-directory
1.39 Learn the Zen of Python	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#learn-the-zen-of-python
1.40 Use C-Style Braces Instead of Indentation to Denote Scopes	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#use-c-style-braces-instead-of-indentation-to-denote-scopes
2 Table of contents	https://github.com/roycoding/python-by-example/blob/master/python-by-example.rst#id1
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