Join Jungwoo Ryoo for an in-depth discussion in this video Memento example, part of Python: Advanced Design Patterns.
- [Instructor] In this memento example,…we import the pickle module.…The pickle module allows us to serialize…and de-serialize Python objects.…In other words, it can transform an object…into a tech stream before saving it into a file.…The reverse is also possible and referred to as…de-serializing.…We'll use this useful feature, provided…by the pickle module in our example…to demonstrate how we can save the state…of an object at a certain time…and restore its previous state.…
Let's first define our originator class.…Here we can create a constructor…that sets the initial state of an originator object…to none by typing self._state = None.…We then define our method to create a memento object,…the name of the method is create_memento.…
Type "return pickle.dumps(vars(self))".…All this does is using the pickle module method…called dumps and turns an originator object…into a character stream.…By the way, the VARS method is a built in…Python function that returns a dictionary…containing all the attribute value pairs…of an object.…
- Architectural vs. design patterns
- Why use design patterns?
- Design best practices
- Domain-specific patterns and security patterns
- Gang of Four design patterns
- Command, Mediator, and State
- Template method
Skill Level Advanced
1. Understanding Design Patterns: Review
2. Design Best Practices
3. Gang of Four (GoF) Patterns, Part 1
4. Gang of Four (GoF) Patterns, Part 2
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