The strategy pattern is a widely used design pattern that help you write better Python code. I’ll show you how to apply the strategy using a practical example written in Python. I’ll cover both the classic object-oriented version of the pattern, and I’ll also show you a functional version that’s a bit shorter to write and works equally well. At the end of the video, there’s a more advanced bit where you’ll see how to add type hints for functions as parameters.
All parts in this series:
Part 1: Cohesion and coupling - https://youtu.be/eiDyK_ofPPM
Part 2: Dependency inversion - https://youtu.be/Kv5jhbSkqLE
Part 3: The strategy pattern - https://youtu.be/WQ8bNdxREHU
Part 4: The observer pattern - https://youtu.be/oNalXg67XEE
Part 5: Unit testing and code coverage - https://youtu.be/jmP3fp_BhmE
Part 6: Template method and bridge - https://youtu.be/t0mCrXHsLbI
Part 7: Exception handling - https://youtu.be/ZsvftkbbrR0
Part 7b: Monadic error handling - https://youtu.be/J-HWmoTKhC8
Part 8: Software architecture - https://youtu.be/ihtIcGkTFBU
Part 9: SOLID principles - https://youtu.be/pTB30aXS77U
Part 10: Object creation patterns - https://youtu.be/Rm4JP7JfsKY
Relevant books:
- Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides: https://amzn.to/3jllgyH
- Principles of Package Design: Creating Reusable Software Components by Matthias Noback: https://amzn.to/2NETK3l
- Clean Code: A Handbook of Agile Software Craftsmanship by Robert Martin: https://amzn.to/3qVZgNs
- The original Design Principles and Design Patterns article by Robert Martin: https://fi.ort.edu.uy/innovaportal/file/2032/1/design_principles.pdf
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You can find the code I worked on in this episode in my GitHub repository: https://github.com/arjancodes/betterpython
Chapters:
0:00 Intro
1:30 Code example
3:21 Main problem with the code
4:01 Switching to a strategy pattern
5:23 Creating concrete strategies
6:56 Updating the process_tickets method
10:09 Adding a new strategy
11:03 A functional version of the strategy
13:18 Adding a function type hint
14:49 Outro
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