Interview question

How do you work with templates in web frameworks? Web frameworks में templates के साथ कैसे काम करते हैं?

Answer

# Flask templates with Jinja2
from flask import Flask, render_template

app = Flask(__name__)

@app.route('/hello/<name>')
def hello(name):
    return render_template('hello.html', name=name, age=25)

# hello.html template
# <h1>Hello, {{ name }}!</h1>
# <p>Age: {{ age }}</p>
# 
# {% if age >= 18 %}
#   <p>You are an adult</p>
# {% else %}
#   <p>You are a minor</p>
# {% endif %}
# 
# {% for item in items %}
#   <p>{{ item }}</p>
# {% endfor %}

# Django templates
from django.shortcuts import render

def view(request):
    context = {'name': 'John', 'items': [1, 2, 3]}
    return render(request, 'template.html', context)

# template.html
# <h1>Hello, {{ name }}</h1>
# 
# {% for item in items %}
#   <p>{{ item }}</p>
# {% endfor %}
# 
# {% load static %}
# <link rel="stylesheet" href="{% static 'css/style.css' %}">

# Template inheritance
# base.html
# <!DOCTYPE html>
# <html>
# {% block content %}
# {% endblock %}
# </html>
# 
# child.html
# {% extends 'base.html' %}
# 
# {% block content %}
# <h1>Child content</h1>
# {% endblock %}

# FastAPI with Jinja2
from fastapi import FastAPI
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
from starlette.requests import Request

app = FastAPI()
app.mount('/static', StaticFiles(directory='static'), name='static')
templates = Jinja2Templates(directory='templates')

@app.get('/items/{id}')
async def read_item(request: Request, id: str):
    return templates.TemplateResponse('item.html', {'request': request, 'id': id})

Flask (Jinja2):
return render_template('template.html', var=value)

Django:
return render(request, 'template.html', context)

Template syntax:
{{ variable }}
{% for item in items %}
{% if condition %}
{% block name %}

Template inheritance:
{% extends 'base.html' %}
{% block content %}
{% endblock %}

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