flask commands to activate/deactivate a class in Bootstrap

Ok guys, here is my issue when developing my app with flask.

I have a layout.html file which is a simple Bootstrap template basically.

I have a navigation list with a few elements, but let's consider the first 2 just to keep it super simple.

<ul class="nav navbar-nav navbar-right">
    <li {{ home_active }}><a href="/">Home</a></li>
    <li {{ places_active }}><a href="/places">Places</a></li> 
</ul>

To insert class="active", so that the nav item is highlighted after clicking on it I have come out with the above solution: the 2 <li> are my edits. In the app.py I placed this code:

@app.route('/')
@app.route('/home')
def index():
    return render_template('index.html', home_active="class=active")

@app.route('/places')
def map():
    return render_template('places.html', places_active="class=active")

I am decently happy at the moment as things are working as I wanted after quiet a number of tries, but I am pretty sure this way of sorting this problem is terrible: I had to write so much code for such a little thing.

Do you guys know a better way to deal with this?

If so, kindly let me know!

Ty

Vittorio