Template inheritance notes

Author: HarshKumarSaw

02.Flask/02.Template_Inheritance.md

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+# 🧱 Template Inheritance in Flask (Jinja2)
+
+- Used in **HTML**, not Python → works with `.html` templates  
+- Helps avoid repeating code like headers/footers  
+
+---
+
+## 🗂️ Base Template (`layout.html`)
+
+```html
+<header>...</header>
+{% block body %}{% endblock %}
+<footer>...</footer>
+```
+
+- `layout.html` holds common structure (header, footer)  
+- `{% block body %}` defines a replaceable section  
+
+---
+
+## 📄 Child Template (e.g. `index.html`)
+
+```html
+{% extends "layout.html" %}
+{% block body %}
+  <!-- Page-specific content here -->
+{% endblock %}
+```
+
+- `{% extends %}` loads `layout.html`  
+- Content inside `{% block body %}` replaces the block in `layout.html`  
+
+---
+
+## 🧠 How It Works
+
+- `extends` pulls in layout  
+- `block` replaces parts of layout  
+- Result: header + your content + footer  
+
+---
+
+## ✅ Summary
+
+- Shared layout → `layout.html`  
+- Unique content → inside `{% block %}` in child templates  
+- Keeps templates clean & DRY