Any way to add a new line from a string with the '\n' character in flask?

Question

I was playing around with flask when I came across an odd problem with the '\n' character. it dosen't seem to have an effect in my browser, I tried putting
in there but it didn't work, any ideas?

from flask import Flask from flask import render_template test=Flask(__name__) @test.route('/') def root():     str='yay\nsuper'     return str test.run(debug=True) 

Answer 1

So it turns out that flask autoescapes html tags. So adding the <br> tag just renders them on screen instead of actually creating line breaks.

There are two workarounds to this:

1. Break up the text into an array

   text = text.split('\n') 

   And then within the template, use a for loop:

   {% for para in text %}     <p>{{para}}</p> {% endfor %} 

2. Disable the autoescaping

   First we replace the \n with <br> using replace:

   text = text.replace('\n', '<br>') 

   Then we disable the autoescaping by surrounding the block where we require this with

   {% autoescape false %}     {{text}} {% endautoescape %} 

   However, we are discouraged from doing this:

   Whenever you do this, please be very cautious about the variables you are using in this block.

I think the first version avoids the vulnerabilities present in the second version, while still being quite easy to understand.