How to build python app blog

[carlosabadia]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a new blog post ("How to Build a Python Web App: Complete Tutorial") and a minor spacing fix to code_block_dark that aligns its bottom margin (mb-4) with the existing code_block component.

The blog post is well-structured and covers the full Reflex development lifecycle. However, two code examples contain errors that would produce runtime failures for readers who copy-paste them:

• Incorrect database query (session.exec(User).all()): session.exec() requires a select() statement, not a bare model class. The example is also missing the required select import.
• Invalid dict Var attribute access (AppState.router.page.params.username): router.page.params is a Dict[str, str] Var; the correct access pattern is bracket notation ["username"], not dot notation.

Confidence Score: 3/5

• Safe to merge after fixing the two broken code examples in the blog post.
• The code.py change is trivial and correct. The blog post contains two code snippets that would produce runtime errors if followed — fixing them is necessary before publishing to avoid misleading readers.
• blog/how-to-build-python-web-app-complete-tutorial.md — the database query and router params examples need correction.

Important Files Changed

Filename	Overview
blog/how-to-build-python-web-app-complete-tutorial.md	New blog tutorial covering Reflex full-stack development. Two code examples contain bugs: session.exec(User) must be session.exec(select(User)), and router.page.params.username should use bracket access ["username"].
pcweb/templates/docpage/blocks/code.py	Minor style fix — adds mb-4 bottom margin to code_block_dark, making it consistent with the existing code_block component. No logic issues.

Sequence Diagram

sequenceDiagram
    participant User
    participant Browser
    participant ReflexFrontend
    participant ReflexBackend
    participant Database

    User->>Browser: Visit page
    Browser->>ReflexFrontend: Load React (compiled from Python)
    ReflexFrontend->>ReflexBackend: WebSocket connection
    User->>ReflexFrontend: Click button (on_click event)
    ReflexFrontend->>ReflexBackend: Dispatch event handler
    ReflexBackend->>Database: session.exec(select(User)).all()
    Database-->>ReflexBackend: Return rows
    ReflexBackend-->>ReflexFrontend: State delta (updated vars)
    ReflexFrontend-->>Browser: Reactive UI update

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_{Last reviewed commit: "add blog"}