Диаграмма классов python пример

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UML diagram list of GoF design pattern examples written in Python.

takaakit/uml-diagram-for-python-design-pattern-examples

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README.md

UML Diagram for Python Design Pattern Examples

This project lists UML diagrams of the «Design Pattern Examples in Python». When you click on a diagram image, the diagram will be opened in Diagram Map. If you want to know about Diagram Map, see this post.

Chain of Responsibility	Command	Interpreter
Python Code Execution Result	Python Code Execution Result	Python Code Execution Result
Iterator	Mediator	Memento
Python Code Execution Result	Python Code Execution Result	Python Code Execution Result
Observer	State	Strategy
Python Code Execution Result	Python Code Execution Result	Python Code Execution Result
Template Method	Visitor
Python Code Execution Result	Python Code Execution Result

Abstract Factory	Builder	Factory Method
Python Code Execution Result	Python Code Execution Result	Python Code Execution Result
Prototype	Singleton
Python Code Execution Result	Python Code Execution Result

Adapter	Bridge	Composite
Python Code Execution Result	Python Code Execution Result	Python Code Execution Result
Decorator	Facade	Flyweight
Python Code Execution Result	Python Code Execution Result	Python Code Execution Result
Proxy
Python Code Execution Result

• Gamma, E. et al. Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley, 1994
• Hiroshi Yuki. Learning Design Patterns in Java [In Japanese Language], Softbank publishing, 2004

Diagram Map file (DiagramMap.html) includes the following libraries:

• D3 library is copyrighted by Mike Bostock and is released under the BSD license.
• Popper library is copyrighted by Federico Zivolo and is released under the MIT license.
• Tippy library is copyrighted by atomiks and is released under the MIT license.

Files and data in this project other than the above libraries are under the Creative Commons Zero (CC0) license.

About

UML diagram list of GoF design pattern examples written in Python.

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UML Diagrams

Unified Modeling Language (UML) Diagrams are used throughout this book to help describe the patterns.

Below are some example self describing UML diagrams.

The left part of the diagram shows the basic concept, and the right side shows a potential example usage.

A Basic Class

Directed Association

A filled arrow with a line.

ClassA uses ClassB or an object of ClassB.

ClassA calls a static class method, a static abstract method or a method/property/field from an object of type ClassB. E.g., The Person starts the Car engine.

A Class That Extends/Inherits A Class

An unfilled arrow, with a line pointing to the class that is being extended/inherited.

ClassA extends ClassB.

The extended class contains all the attributes/fields and methods of the inherited class, including its own extra methods, attributes/fields, overrides and overloads.

A Class That Implements An Interface

An unfilled arrow, with a dashed line pointing to the interface that is being implemented.

ClassA implements ClassB.

A class that implements an interface must implement all the methods declared in the interface.

Aggregates

An unfilled diamond with a line and arrow head.

ClassA aggregates ClassB.

Library aggregates Books. Books and Library can exist independently of each other. Books can exist without the Library.

Composition

A filled diamond with a line and arrow head.

ClassA is composed of ClassB

Aeroplane can be composed of Wings and other parts. But an aeroplane is no longer really an aeroplane without its wings.

Pseudocode Annotation

A box with a dashed line and a circle placed near a class method.

Pseudocode is a plain language description of the steps in an algorithm and used to portray a concept without needing to write long lines of code.

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Implementing Class Diagram with Python

Previously, I wrote a post about how to create a Class diagram from a given scenario. In summary, to design a class diagram is to understand the scenario wholly and then be creative about it. And then turn my extended imagination of the scenario, my justification and reasoning into a diagram. Now, the new challenge is: how to make a program based on a Class diagram? I was given this diagram as the scenario and asked to use Python to implement the diagram. In general, the steps I took are:

1. Identify the relationship
2. Create classes and their constructor first
3. Create the method for each class

Identifying the relationship first rather than classes will helped me to measure the complexity of the program that I will create. Knowing its complexity will also help you in many other things, such as how you should organize the source code.

I ended up making one file for each classes, and keep them in a single folder. Keeping all the classes source code in a single folder helps me to efficiently manage the code. When I wrote the code, I had to go back and forth, switching from source to diagram. By isolating what I’m viewing in my code editor, I was able to focus and not feel overwhelmed by many lines of code. Although, the caveat is that the main.py , which the main code for the program, ended up being having so many imports.

I received several feedbacks from my lecturer. Two important things that I would like to mention is that:

1. Code should be self-explanatory.
2. The testing will be better if using the unittest library.

At first, I tried to understand what self-explanatory means. I googled and found what my lecturer meant.

In this blog post written by Kevin and this answer on StackOverflow by user ine, their arguments are pointing to the same thing: that code should be having no-comments at all, but people are still understand it. This doesn’t mean to not comment the code at all. Rather, there are several things that we can do first, before removing all comments from the code.

Kevin said that to make sure that the code is self-explanatory, the same logic should be tested in different ways: source code, documentation, and tests (unit testing). The reason why it is not enough to just do one logic test, Kevin shared a story where unit testing is 100% passed, but products the customer ordered are not delivered. The culprit was found after drawing a simple sequence diagram and bug fix is delivered.

Yusuf

My world spins around data and games. Currently helping an eSport team to sit on the SEA throne through data and a master student.

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