Print End-Of-Line character in Flask, Python

I'm using render_template_string() method of Flask to generate HTML code, but I can't generate the end of line character. I tried the "\n" character, but it doesn't work. That is, in the generated page (when you right-click -> look at the page code), all the generated HTML code is in one line.

PHP had a constant PHP_EOL that did the job just fine, is there something similar in Python?

The code below generates a code merged into one line.

    return render_template_string( '<p>'+ text +'</p>'+'\n') + \           render_template_string( '</details>'+'\n')