my loop are confuse in multiple list difference size in flask

Question

I want a result like:

1:                    
2:    
3: 3 p3 33  
4: 4 p4 44  
....  
...

But what I get is

1:  
2:  
3: 3 p3 33  
3: 4 p4 44  
3: 7 p7 77  
...   

This is my python code

str1 = [3,4,7,9]
n_save = ['p3','p4','p7','p9']
d_save = ['33','44','77','99']
zipped = zip(str1,n_save,d_save)
 
# flask code
 
    {% for i in range(0,10) %}<br>
    {% if i+1 in str1|list %}
        {% for numm,namee,dd in zipped %}

    <option value="{{ i+1 }}">  {{ i+1 }} : {{ namee }} {{ dd }}</option>
            {% endfor %}
   {% else %}
        <option value="{{ i+1 }}"> {{ i+1 }} : </option>
   {% endif %}

{% endfor %}

Any help appreciated.

Answer 1

In the example below, the iterator is first converted into a list.
A pointer to the current index of the zipped list is then created using a namespace.
Now the respective entry of the list can be unpacked.

{% set data = zipped | list -%}
{% set ctx = namespace(index0=0) -%}
{% for i in range(1,11) -%}
  {% if ctx.index0 < (data | length) and i == data[ctx.index0][0] -%}
    {% set _, namee, dd = data[ctx.index0] -%}
    <option value="{{ i }}">{{ i }} : {{ namee }} {{ dd }}</option>
    {% set ctx.index0 = ctx.index0 + 1 -%}
  {% else -%}
    <option value="{{ i }}">{{ i }} : </option>
  {% endif -%}
{% endfor -%}