These double curly braces simply tell our Flask app that what is between the braces is python code and then it is interpreted as such. So, where we were interpolating our params in our string of HTML ...

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To run the application, use python -m flask run in the same directory as ... the Jinja2 template engine to programmatically generate HTML output from data. You use the render_template function ...

A basic “hello world” app can be set up in fewer than 10 lines of Python. Flask includes a widely used HTML templating system, Jinja2, to make rendering text easy, but Jinja2 can be swapped ...