Jinja is Flask’s templating system: Python route code passes data into an HTML template, where expressions display values and control directives repeat or organize markup. section 5.3.3 section 7.1.1
Render database results on an index page
A Flask route calls a data function and passes its result to index.html with render_template. The template loops over data and prints each item with {{ item }}. When errors appear, verify imports, the template location, and the application’s expected templates folder; generated suggestions may use incorrect names or file structures. section 5.3.3
# Import the function that contains the data you want to extract from my_module import get_data # Create a route for the HTML index page @app.route('/') def index(): # Call the function and store the returned data in a variable data = get_data() # Return the HTML template for the index page return render_template('index.html', data=data) <!-- HTML template for the index page --> <!DOCTYPE html> <html> <head> <title>Index Page</title> </head> <body> <h1>Data</h1> <ul> {% for item in data %} <li>{{ item }}</li> {% endfor %} </ul> </body> </html>
Shows the complete route-to-template flow, including data retrieval, render_template, a Jinja for-loop, and value interpolation. section 5.3.3
