What is this?
Jinja is a fast, expressive, extensible template engine for Python: you write placeholders in a template using Python-like syntax, then pass it data to render a final document such as HTML.
Jinja is a fast, expressive, extensible template engine for Python: you write placeholders in a template using Python-like syntax, then pass it data to render a final document such as HTML.Is this a standalone app or a library I import into Python code?It's a Python library (pip-installable as Jinja2) that you import and use inside your own application, not a standalone program. It's maintained by the Pallets organization, the same team behind Flask.
It's a Python library (pip-installable as Jinja2) that you import and use inside your own application, not a standalone program. It's maintained by the Pallets organization, the same team behind Flask.How do I start using Jinja in a project?Install the Jinja2 package, create an Environment, load a template, and call render() with your data to get the final document.
Install the Jinja2 package, create an Environment, load a template, and call render() with your data to get the final document.Do I need anything extra for translating templates?Core templating needs nothing beyond Jinja itself, but internationalization (I18N) support relies on the Babel library.
Core templating needs nothing beyond Jinja itself, but internationalization (I18N) support relies on the Babel library.Is it safe to render templates written by untrusted users out of the box?Not automatically — you have to deliberately use Jinja's sandboxed environment to safely render untrusted templates, and HTML autoescaping to prevent XSS has to be enabled for the context you're using.
Not automatically — you have to deliberately use Jinja's sandboxed environment to safely render untrusted templates, and HTML autoescaping to prevent XSS has to be enabled for the context you're using.Who typically uses Jinja?Python web developers rendering HTML (notably Flask apps) and anyone generating text output — configs, emails, code — from templates with Python-like logic.
Python web developers rendering HTML (notably Flask apps) and anyone generating text output — configs, emails, code — from templates with Python-like logic.Can templates share layout or reusable snippets?Yes, Jinja supports template inheritance and inclusion, plus defining and importing macros within templates.
Yes, Jinja supports template inheritance and inclusion, plus defining and importing macros within templates.Does Jinja support async Python code?Yes, it has AsyncIO support for generating templates and calling async functions.
Yes, it has AsyncIO support for generating templates and calling async functions.How fast is Jinja compared to just formatting strings in Python?Templates are compiled to optimized Python code just-in-time and cached, or can be compiled ahead-of-time, which is why Jinja is described as a very fast engine.
Templates are compiled to optimized Python code just-in-time and cached, or can be compiled ahead-of-time, which is why Jinja is described as a very fast engine.What happens when a template has a bug?Jinja points exceptions to the correct line inside the template file itself, making debugging template errors easier than with typical compiled output.
Jinja points exceptions to the correct line inside the template file itself, making debugging template errors easier than with typical compiled output.