Multi-tier application

As explained in Practices of the Python Pro

A multitier architecture organizes an application into separate layers or tiers with distinct responsibilities that can evolve independently.

A multitier architecture separates an application into layers with distinct responsibilities. Presentation handles interaction, persistence stores data, and business logic connects the two. Because each tier can evolve independently, teams can specialize and reuse layers across applications. section 6.3

A bookmarking application

Bark divides its command-line interface, actions and business rules, and database operations into separate Python modules. This structure supports adding features such as importing GitHub stars while reducing coupling between application areas. section 6.3 section 11.5.1

Figure 6.2. CRUD operations are the basis of many applications that manage user data.

Use the CRUD diagram to connect common user-data operations with the layers that present, process, and persist them. section 6.3

How Practices of the Python Pro covers it

How deep it goes

Explains responsibilities, module boundaries, reuse, and team specialization without detailing implementation internals.

Examples

Uses Bark’s command-line interface, database, Python modules, CRUD operations, and GitHub-star import feature.

What you can do after

Builds applications with separate presentation, business-logic, and persistence layers that support later extension.

How it connects

Connects separation of concerns with MVC, MVVM, interfaces, command pattern, and reduced coupling.

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Also explained in

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  Go by ExampleA layered package structure is an organization in which packages depend only on packages in lower layers of the structure.
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  BDD in Action, Second EditionLayered architecture is a software architecture pattern that organizes responsibilities into layers with controlled dependencies between them.
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  Java Persistence with Spring Data and Hibernate epubA layered architecture organizes an application into separate layers with distinct responsibilities and controlled dependencies.
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  Terraform in Depth: Infrastructure as Code with Terraform and OpenTofuA three-tier application is an application architecture that separates presentation, application, and data responsibilities into distinct tiers.

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Related concepts

• stratified designused by · An architectural pattern that organizes software into layers ordered from relatively stable foundations to more frequently changing elements.
• frontend developmenthas part · Frontend development is the practice of building the user-facing, client-side interfaces and behavior through which people interact with software.
• data layerhas part · A data layer is an architectural part of a system that organizes access to, management of, or persistence of data for other components.
• business logichas part · Business logic is the domain-specific rules, computations, and decisions that determine how a software system behaves and processes operations.
• domain layerhas part · A domain layer is an architectural part of an application that contains its domain concepts, rules, and behavior.
• hexagonal architecturecontrasts with · Hexagonal architecture is a software architecture pattern that isolates an application’s core logic from external systems through ports and adapters.

This explainer was generated by Manning's knowledge graph from the text of Practices of the Python Pro. The section links point to the parts of the book it draws on.