Practical Python Design Patterns22 Design Pattern Quick Reference APPENDIX A : Design Pattern Quick Reference Quick Checks for the Code Singleton Pattern Prototype Pattern Factory Pattern Builder Pattern Adapter Pattern Decorator Pattern Facade Pattern Proxy Pattern Chain of Responsibility Pattern Composite Command Pattern Interpreter Pattern Iterator Pattern Observer Pattern State Pattern Strategy Pattern 327 ' Wessel Badenhorst 2017 W. Badenhorst, Practi.. 2023. 3. 29. PUBLISH–SUBSCRIBE PATTERN CHAPTER PUBLISH–SUBSCRIBE PATTERN def unregister(self, callback): self.callbacks.discard(callback) def unregister_all(self): self.callbacks = set() def poll_for_change(self): if self.changed: self.update_all def update_all(self): for callback in self.callbacks: callback(self) Although the observer pattern allows us to decouple the objects that are observed from knowing anything about the objects.. 2023. 3. 29. Model-View-Controller Pattern CHAPTER 19 Model-View-Controller Pattern Always, worlds within worlds. Clive Barker, Weaveworld Not far along in your journey as a programmer, you begin to see some other patterns emerge more like patterns of patterns. Like this one. Most if not all programs consist of some sort of external action that initiates the program. The initiating action may or may not have data, but if it does, the pro.. 2023. 3. 29. Visitor Pattern CHAPTER 19 Visitor Pattern I want to believe. X-Files Since Python can be found in many places, you might one day want to do a little bit of home automation. Get a couple of single-board and micro computers and connect them to some hardware sensors and actuators, and soon you have a network of devices, all controlled by you. Each of these items in the network has its own functionality, and each .. 2023. 3. 29. Template Method Pattern CHAPTER 17 Template Method Pattern Success without duplication is merely future failure in disguise. Randy Gage in How to build a multi-level money machine: the science of network marketing In life, as in coding, there are patterns, snippets of actions that you can repeat step by step and get the expected result. In more complex situations, the details of the unique steps may vary, but the overa.. 2023. 3. 29. Strategy Pattern CHAPTER Strategy Pattern Move in silence, only speak when it s time to say Checkmate. Unknown From time to time, you might find yourself in a position where you want to switch between different ways of solving a problem. You essentially want to be able to pick a strategy at runtime and then run with it. Each strategy might have its own set of strengths and weaknesses. Suppose you want to reduce .. 2023. 3. 29. State Pattern CHAPTER 15 State Pattern Under pressure. Queen, Under Pressure A very useful tool for thinking through software problems is the state diagram. In a state diagram, you construct a graph, where nodes represent the state of the system and edges are transitions between one node in the system and another. State diagrams are useful because they let you think visually about the state of your system giv.. 2023. 3. 29. Observer Pattern CHAPTER Observer Pattern You know, Norton, I ve been watching you. Eddie Murphy, Delirious If you did the object calisthenics exercise from chapter 12, you would have noticed how difficult it is to reduce the number of lines used in certain methods. This is especially difficult if the object is too tightly coupled with a number of other objects; i.e., one object relies too much on its knowledge .. 2023. 3. 29. Iterator Pattern CHAPTER 13 Iterator Pattern e wheels of the bus go round and round, round and round, round and round Data structures and algorithms form an integral part of the software design and development process. Often, different data structures have different uses, and using the right data structure for a specific problem might mean a lot less work and a lot more efficiency. Choosing the correct data stru.. 2023. 3. 29. 이전 1 2 3 다음