Python Patterns

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Short description:

python-patterns - A collection of design patterns and idioms in Python (With tests!).

Current Patterns

Creational Patterns:

| Pattern | Description | Tests | |:-------:| ----------- |------| | Abstract Factory | use a generic function with specific factories | test | | Builder | instead of using multiple constructors, builder receives parameters and returns constructed objects | test | | Factory Method | delegate a specialized function/method to create instances| test | | Prototype | use a factory and clones of a prototype for new instances (if instantiation is expensive) | test | | Singleton | Ensures that the class has only one instance, and provides a global access point to it. | test |

Structural Patterns:

| Pattern | Description | Tests | |:-------:| ----------- |------| | Adapter | converts the interface of one class to the interface of another that clients expect. | test | | Bridge | a client-provider middleman to soften interface changes | test | | Composite | lets clients treat individual objects and compositions uniformly | test | | Decorator | wrap functionality with other functionality in order to affect outputs | test | | Facade | use one class as an API to a number of others | test | | Flyweight | transparently reuse existing instances of objects with similar/identical state | test | | Proxy | an object funnels operations to something else | test |

Behavior Patterns:

| Pattern | Description | Tests | |:-------:| ----------- |------| | Blackboard | architectural model, assemble different sub-system knowledge to build a solution, AI approach - non gang of four pattern. | test | | chain_of_responsibility | apply a chain of successive handlers to try and process the data. | test | | command | bundle a command and arguments to call later. | test | | interpreter | a behavioral design pattern that solves a frequently encountered but subject to change problem. | test | | iterator | traverse a container and access the container's elements. | test | | mediator | an object that knows how to connect other objects and act as a proxy. | test | | memento | generate an opaque token that can be used to go back to a previous state. | test | | observer | provide a callback for notification of events/changes to data. | test | | state | logic is organized into a discrete number of potential states and the next state that can be transitioned to. | test | | strategy | selectable operations over the same data. | test | | template_method |defines the basis of the algorithm and allows subclasses to override some of the steps in the algorithm, without changing its structure as a whole. | test | | visitor | invoke a callback for all items of a collection. | test |

Help:

Requirements:

• python 3.6+

For run tests:

• pytest

  • pip3 install pytest
  • pytest -v

• pytest-cov

  • pip3 install pytest-cov
  • pytest --cov

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Information:

Licensed under the terms of the BSD 3-Clause License

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Copyright (c) 2018-2021, A.A Suvorov; All rights reserved.
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