How to use the Len function in a python template - Flask

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I have an Appweb in python-Flask that would like to show the amount of players online, only I’m a little lost in this part already tried {% Len(date) %} and {% data|length %} and no two methods worked. if anyone can help me in this part.

Note: the variable "date" brings me a json dictionary of the game served.

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html code

<!DOCTYPE html>

<html>
<head>
    <meta charset="utf-8"/>    
    <title>Infinite Fight Brasil</title>    
    <link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">



</head>
<body>
    {% extends "bootstrap/base.html" %}
        {% block  content %}


        <div id="carregando" class="center" align="center">
            <br><br><iframe src='https://www.liveflightapp.com/embed?key=d92f147c-1300-462f-84a0-e198ff0aeb01' width='80%'height='500px' frameborder='0' scrolling='no'></iframe>
            <br>
            <br>
        </div>
        <br>
        <br>



        <div id="quant">
            <h2> No momento a xxx online nesse momento.</h2>
        </div>

        <br>

        <div class="container">
            <table id="customers">
                <tr>
                    <th>Piloto</th>
                    <th>Voo</th>
                    <th>DEP - ARR</th>
                    <th>Altitude</th>
                    <th>Velocidade</th>
                    <th>Online</th>

                </tr>
                {% for i in range(930) %}
                    {% if "IFBR" in data[i]["DisplayName"] %}
                    <tr>
                        <td>{{data[i]["DisplayName"]}}</td>
                        <td>{{data[i]["CallSign"]}}</td>
                        <td>--------</td>
                        <td>{{"{0:.0f} ft".format (data[i]["Altitude"])}}</td>
                        <td>{{"{0:.0f} kts".format (data[i]['Speed'])}}</td>
                        <td>Expert Server</td>                    
                    </tr>

                    {% endif %}
                {% endfor %}
            </table>
            <br>
            <br>
            <br>
        </div>
        {% endblock %}

<br>
<br>        
</body>
</html>
-->

part of flask

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
from models.database import BancoDados

app = Flask(__name__)
Bootstrap(app)

@app.route('/')
def index():
    return render_template('index.html', data=BancoDados.total())

if __name__ == '__main__':
    app.run(debug=True)
python template flask

1 answer

2


Simple, just use the jinja2 filter itself:

<h2> No momento a {{ data|length }} online nesse momento.</h2>

Or else:

<h2> No momento a {{ data|count }} online nesse momento.</h2>

Same thing for "for":

{% for i in range(data|length) %}

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