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Hands-On Enterprise Application Development with Python

You're reading from   Hands-On Enterprise Application Development with Python Design data-intensive Application with Python 3

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Product type Paperback
Published in Dec 2018
Publisher Packt
ISBN-13 9781789532364
Length 374 pages
Edition 1st Edition
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Author (1):
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Saurabh Badhwar Saurabh Badhwar
Author Profile Icon Saurabh Badhwar
Saurabh Badhwar
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Table of Contents (19) Chapters Close

Preface 1. Using Python for Enterprise 2. Design Patterns – Making a Choice FREE CHAPTER 3. Building for Large-Scale Database Operations 4. Dealing with Concurrency 5. Building for Large-Scale Request Handling 6. Example – Building BugZot 7. Building Optimized Frontends 8. Writing Testable Code 9. Profiling Applications for Performance 10. Securing Your Application 11. Taking the Microservices Approach 12. Testing and Tracing in Microservices 13. Going Serverless 14. Deploying to the Cloud 15. Enterprise Application Integration and its Patterns 16. Microservices and Enterprise Application Integration 17. Assessment 18. Other Books You May Enjoy

The Factory pattern

During the development of large applications, there are certain cases where we might want to initialize a class dynamically, based upon the user input or some other dynamic factor. To achieve this, either we can initialize all the possible objects during the class instantiation and return the one that is required based on the inputs from the environment, or we can altogether defer the creation of class objects until an input has been received.

The Factory pattern is the solution to the latter case, where we develop a special method inside a class, which will be responsible for initializing the objects dynamically, based on the input from the environment.

Now, let's see how we can implement the Factory pattern in Python in a simplistic way, and then we will see how we can use the dynamic nature of Python to make our Factory class more dynamic.

So, let&apos...

You have been reading a chapter from
Hands-On Enterprise Application Development with Python
Published in: Dec 2018
Publisher: Packt
ISBN-13: 9781789532364
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