Jinja2

Powerful templating engine for Python.

Quick Start

from jinja2 import Environment, FileSystemLoader

env = Environment(loader=FileSystemLoader('templates'))
template = env.get_template('report.html')
output = template.render(data=my_data)

Template Syntax

<!-- Variable -->
<h1>{{ title }}</h1>

<!-- Loop -->
<ul>
{% for item in items %}
    <li>{{ item.name }}: {{ item.value }}</li>
{% endfor %}
</ul>

<!-- Conditional -->
{% if score > 90 %}
    <span class="high">Excellent</span>
{% elif score > 70 %}
    <span class="medium">Good</span>
{% else %}
    <span class="low">Needs improvement</span>
{% endif %}

Filters

{{ name|upper }}
{{ value|round(2) }}
{{ list|join(', ') }}
{{ date|default('N/A') }}
{{ text|truncate(100) }}

Python Usage

# String template
from jinja2 import Template
t = Template("Hello {{ name }}!")
result = t.render(name="World")

# With context
template.render(
    title="Report",
    data=df.to_dict('records'),
    generated=datetime.now()
)