Learning Flask from Scratch: Template Inheritance and Variable Rendering

This article introduces the core of the Flask template system, which uses the Jinja2 engine to implement dynamic HTML rendering. Key skills include: 1. **Variable Rendering**: Embed Python variables (supporting strings, numbers, lists, dictionaries) in HTML using the `{{ variable }}` syntax. Variables are passed via `render_template` in view functions, with support for loops (`{% for %}`) and conditional checks (`{% if %}`). 2. **Template Inheritance**: Define a base template (base.html) with `{% block %}` placeholders. Child templates inherit from the base via `{% extends %}` and override content blocks to reuse common structures like navigation bars and footers, avoiding code duplication. The project structure includes app.py (main program) and a templates folder for storing templates. The article also addresses common issues and solutions, summarizing that variable rendering and template inheritance are fundamental to Flask development.