Jinja template in Flask

app.py

from flask import Flask
from jinja2 import Environment, FileSystemLoader

j2_env = Environment(loader=FileSystemLoader('templates'), trim_blocks=True)
app = Flask(__name__)

@app.route('/')
def home():
    return j2_env.get_template('index.j2').render(name='Nitin')

def main():
    app.run(debug=True)

if __name__=='__main__':
    main()

index.j2

{% extends "layout.j2" %}
{% block content %}
<p>
Hello {{name}}
</p>
{% endblock %}