How to create for and if loop for inputs in jinja flask

Solution

@app.route('/', methods=['GET', 'POST'])
def index():
    x = 4
    if request.method == 'POST':
        data = request.form.getlist('a', type=str)
        rslt = ' '.join(data)
    return render_template('index.html', **locals())



  
    
    
  
  
    
    {% set ns = namespace(idx=0) %}
    {% for i in range(1,x) %}
      {% for j in range(i+1,x) %}
      
        {{ '{} vs {}'.format(i,j) }}
        
      
      {% set ns.idx = ns.idx + 1 %}
      {% endfor %}
    {% endfor %}
      
    
    {% if rslt %}
    {{ rslt }}
    {% endif %}

from itertools import combinations

@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        data = request.form.getlist('a', type=str)
        rslt = ' '.join(data)
    x = 4
    pairs = combinations(range(1,x), 2)
    return render_template('index.html', **locals())



  
    
    
  
  
    
      {% for i,j in pairs %}
      
        {{ '{} vs {}'.format(i,j) }}
        
      
      {% endfor %}
      
    
    {% if rslt %}
    {{ rslt }}
    {% endif %}