[advanced] Jinja2 Templating

Jinja2: Getting Started

Jinja2 is a module for inserting data into templates.

As you know, features such as f'' strings and the .format() method are designed to insert "dynamic" data (that is, variables that may be any value) into "static" templates (text that does not change). This demonstrated the concept of templating. Jinja2 offers a full-featured templating system, including the following features:

• Variable insertion (like f'' strings or .format())
• Attribute access (like f'' strings or .format())
• Container subscripting (mylist[0], mydict['thiskey'], etc.)
• Method calls
• if/elif/else conditionals
• for looping over containers or iterable objects

Here is a basic example showing these features:

test.html, stored the test_templates/ directory

Hello, {{ name }}.

Please say it loudly:  {{ compliment.upper() }}!

Must I tell you:
{% for item in pronouncements %}
   {{ item }}
{% endfor %}

Or {{ pronouncements[0] }}?

{% if not reconciled: %}
  We have work left to do.
{% else %}
  I'm glad we worked that out.
{% endif %}

test.py, in the same dir as test_templates

import jinja2

env = jinja2.Environment()
env.loader = jinja2.FileSystemLoader('test_templates')

template = env.get_template('test.html')

print(template.render(name='Joe', compliment="you're great",
                      pronouncements=['over', 'over', 'over again'],
                      reconciled=False))

The rendered template!

Hello, Joe.

Please say it loudly:  YOU'RE GREAT!

Must I tell you:

   over
   over
   and over again

Or over?


  We have work left to do.