Python

Working With the Python operator Module

In this section, you’ll learn about three of the higher-order functions that Python’s operator module makes available to you: itemgetter(), attrgetter(), and methodcaller(). You’ll learn how these allow you to work with Python collections in a range of useful ways that encourage a functional style of Python programming.

Selecting Values From Multidimensional Collections With itemgetter()

The first function that you’ll learn about is operator.itemgetter(). In its basic form, you pass it a single parameter that represents an index. Then itemgetter() returns a function that, when passed a collection, returns the element at that index.

To begin with, you create a list of dictionaries:

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