How to Build a Full‑Featured Python Blog from Scratch: Step‑by‑Step Guide

1. File Structure

The project follows a clear directory layout, as illustrated below:

2. Key Technologies

The core concepts include the HTTP request‑response cycle:

1. Client (browser) initiates a request. 2. Router distributes the request; the add_routes function registers routes. 3. Middleware pre‑processes the request (logging, authentication, data collection). 4. RequestHandler cleans parameters and calls the controller (view function). 5. Controller executes business logic, optionally using an ORM for database operations. 6. Model layer performs CRUD on the database. 7. Controller returns data. 8. Response factory creates the appropriate HTTP response. 9. Client receives the response.

3. ORM Framework (Day 3‑Day 4)

ORM (Object‑Relation Mapping) maps classes to database tables and objects to rows. Implementation steps:

In orm.py, define ModelMetaclass to create class attributes for mapping and default SQL statements (SELECT, INSERT, UPDATE, DELETE).

Implement Model class with attribute access methods and SQL handling functions such as find, findAll, save, remove.

Define concrete model classes User, Blog, Comment in model.py for application use.

4. Web Framework (Day 5)

The project builds on aiohttp, wrapping it to create a higher‑level web framework. Key steps:

In coroweb.py, the @get decorator attaches HTTP method and path to handler functions; RequestHandler converts URL parameters to web.Response. app.py registers middlewares, routes via add_routes(), initializes Jinja2 templates, and adds static file handling. create_server() starts the server listening thread, which receives requests, passes them through middlewares, invokes the appropriate handler, and uses response_factory to build the final web.Response sent back to the client.

5. Assignment Results

Final UI screenshots:

Blog homepage:

Write blog page:

Article management:

Article detail view:

6. Conclusion

Through this assignment, the author gained a solid understanding of web application development workflow, HTTP fundamentals, and Python usage, while recognizing gaps in Python depth and front‑end knowledge, prompting further practice in Python projects and front‑end technologies.