concept sorted in category python

This is an excerpt from Manning's book Python Workout: 50 ten-minute exercises. Login to get full access to this book.

Table 2.1 What you need to know (view table figure)

Concept	What is it?	Example	To learn more
in	Operator for searching in a sequence	'a' in 'abcd'	http://mng.bz/yy2G
Slice	Retrieves a subset of elements from a sequence	# returns 'bdf' 'abcdefg'[1:7:2]	http://mng.bz/MdW7
str.split	Breaks strings apart, returning a list	# returns ['abc', 'def', 'ghi'] 'abc def ghi'.split()	http://mng.bz/aR4z
str.join	Combines strings to create a new one	# returns 'abc*def*ghi' '*'.join(['abc', 'def', 'ghi'])	http://mng.bz/gyYl
list.append	Adds an element to a list	mylist.append('hello')	http://mng.bz/aR7z
sorted	Returns a sorted list, based on an input sequence	# returns [10, 20, 30] sorted([10, 30, 20])	http://mng.bz/pBEG
Iterating over files	Opens a file and iterates over its lines one at a time	for one_line in open(filename):	http://mng.bz/OMAn

You can solve this exercise several ways, but all will require using the sorted method that you saw in the last chapter, along with a function passed as an argument to its key parameter. You can read more about sorted and how to use it, including custom sorts with key, at http://mng.bz/D28E. One of the options for solving this exercise involves operator.itemgetter, about which you can read here: http://mng.bz/dyPQ.