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Mastering Python Design Patterns - Second Edition
book

Mastering Python Design Patterns - Second Edition

by Kamon Ayeva, Sakis Kasampalis
August 2018
Intermediate to advanced content levelIntermediate to advanced
248 pages
5h 51m
English
Packt Publishing
Content preview from Mastering Python Design Patterns - Second Edition

Implementation

Let's implement a program to fetch content from web pages, inspired by the tutorial from Michael Ford (https://docs.python.org/3/howto/urllib2.html). We have only take the simple part since the focus is to illustrate our pattern more than it is to build a special web-scraping tool.

We will use the urllib module to connect to web pages using their URLs; the core of the program would be the URLFetcher class that takes care of doing the work via a fetch() method.

We want to be able to track the list of web pages that were tracked, hence the use of the singleton pattern: we need a single object to maintain that global state.

First, our naive version, inspired by the tutorial but modified to help us track the list of URLs that ...

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Publisher Resources

ISBN: 9781788837484Supplemental Content