Python Workout: 50 Essential Exercises MEAP V03 by Reuven M. Lerner

Author:Reuven M. Lerner [Lerner, Reuven M.]
Language: eng
Format: epub
Publisher: Manning Publications Co.
Published: 0101-01-01T00:00:00+00:00

4.2 Sets

Closely related to dictionaries are sets (https://docs.python.org/3/library/stdtypes.html#set), which you can think of as dictionaries without values. (I often joke that this means sets are actually immoral dictionaries.) Sets are extremely useful when I need to look something up in a large collection, such as filenames, e-mail addresses, or postal codes, because searching is O(1), just as in a dict. I have also increasingly found myself using sets to remove duplicate values from an input list — such as IP addresses in a logfile, or license plate numbers that have passed through a parking garage entrance in a given day.

In this chapter, you’ll use dictionaries and sets in a variety of ways to solve problems. It’s safe to say that nearly every Python program uses dictionaries, or perhaps an alternative dictionary such as defaultdict from the collections module.

Table 4.1. Reference table

Name Description Example Link

input

prompt the user to enter a string, and return a string

input("Enter your name: ")

https://docs.python.org/3/library/functions.html#input

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