Pass Data into a Template
Send Python variables to the rendered page.
Pass Data into a Template is a free Flask Academy lesson on CoddyKit — lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Flask Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Pages That Change
Static HTML is fine, but real pages show different data per user. You make pages dynamic by passing data from your view into the template.
Keyword Arguments
Add keyword arguments to render_template. Each name you pass becomes a variable you can use inside the HTML file.
return render_template('hi.html', name='Ada')Reading a Variable
Inside the template, print a value with double curly braces. Flask swaps the expression for its result when the page renders.
<h1>Hello, {{ name }}!</h1>The Expression Delimiter
Those {{ }} markers mean output this value here. Anything inside is evaluated and its result is written into the page.
Passing Many Values
You can pass as many keyword arguments as you need. Each one is independent and available throughout the template.
return render_template('p.html', name='Ada', age=36)Passing Lists
Values are not limited to text. You can hand a template a list or any Python object and work with it in the markup.
return render_template('t.html', items=['a','b','c'])Accessing Object Attributes
Use a dot to reach attributes, just like in Python. Templates read object properties the same intuitive way you do in code.
<p>{{ user.email }}</p>Dictionary Lookups
For a dictionary, use either the dot or bracket form. Jinja2 tries attribute access first, then falls back to a key lookup.
{{ data.title }} or {{ data['title'] }}Missing Values Are Safe
If a variable is undefined, Jinja2 renders nothing instead of crashing. That keeps a small typo from breaking the whole page.
Applying Filters
Transform a value on the fly with a filter, written after a pipe. Filters format text without cluttering your Python view.
<h1>{{ name|upper }}</h1>Keep Logic in the View
Do heavy work in Python and pass ready values in. Templates should display data, not compute it, which keeps pages simple.
Quick Check
How do you output a variable named title inside a Jinja2 template?
Recap
You now pass data through keyword arguments and print it with double curly braces, even reaching attributes and applying filters. Great progress! 🚀
Frequently asked questions
Is the “Pass Data into a Template” lesson free?
Yes — the full text of “Pass Data into a Template” is free to read here on the web, and the Flask Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Flask Academy course, upgrade to CoddyKit PRO.
What will I learn in “Pass Data into a Template”?
Send Python variables to the rendered page. You practise Flask Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Flask Academy?
No prior experience is required. Flask Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Pass Data into a Template” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Flask Academy lesson?
Yes. Every Flask Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.