Book Image

Software Architecture with Python

By : Anand Balachandran Pillai
Book Image

Software Architecture with Python

By: Anand Balachandran Pillai

Overview of this book

This book starts by explaining how Python fits into an application's architecture. As you move along, you will get to grips with architecturally significant demands and how to determine them. Later, you’ll gain a complete understanding of the different architectural quality requirements for building a product that satisfies business needs, such as maintainability/reusability, testability, scalability, performance, usability, and security. You will also use various techniques such as incorporating DevOps, continuous integration, and more to make your application robust. You will discover when and when not to use object orientation in your applications, and design scalable applications. The focus is on building the business logic based on the business process documentation, and understanding which frameworks to use and when to use them. The book also covers some important patterns that should be taken into account while solving design problems, as well as those in relatively new domains such as the Cloud. By the end of this book, you will have understood the ins and outs of Python so that you can make critical design decisions that not just live up to but also surpassyour clients’ expectations.
Table of Contents (18 chapters)
Software Architecture with Python
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Thumbnail generator


Let us start our discussion of multi-threading in Python with the example of a program used to generate thumbnails of image URLs.

In the example, we are using Pillow, a fork of the Python Imaging Library (PIL) to perform this operation:

# thumbnail_converter.py
from PIL import Image
import urllib.request

def thumbnail_image(url, size=(64, 64), format='.png'):
    """ Save thumbnail of an image URL """

    im = Image.open(urllib.request.urlopen(url))
    # filename is last part of the URL minus extension + '.format'
    pieces = url.split('/')
    filename = ''.join((pieces[-2],'_',pieces[-1].split('.')[0],'_thumb',format))
    im.thumbnail(size, Image.ANTIALIAS)
    im.save(filename)  
    print('Saved',filename)

The preceding code works very well for single URLs.

Let us say we want to convert five image URLs to their thumbnails:

img_urls = ['https://dummyimage.com/256x256/000/fff.jpg',
            'https://dummyimage.com/320x240/fff/00.jpg',
            'https://dummyimage...