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Software Architecture with Python

You're reading from   Software Architecture with Python Design and architect highly scalable, robust, clean, and high performance applications in Python

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781786468529
Length 556 pages
Edition 1st Edition
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Author (1):
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Anand Balachandran Pillai Anand Balachandran Pillai
Author Profile Icon Anand Balachandran Pillai
Anand Balachandran Pillai
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Table of Contents (12) Chapters Close

Preface 1. Principles of Software Architecture FREE CHAPTER 2. Writing Modifiable and Readable Code 3. Testability – Writing Testable Code 4. Good Performance is Rewarding! 5. Writing Applications that Scale 6. Security – Writing Secure Code 7. Design Patterns in Python 8. Python – Architectural Patterns 9. Deploying Python Applications 10. Techniques for Debugging Index

Thumbnail generator

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

img_urls = ['https...
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