my loop are confuse in multiple list difference size in flask-CodePudding

I want a result like:

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.

CodePudding user response：

Your issue is at


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

You are looping through the entire zipped array which is currently [(3, 'p3', '33'), (4, 'p4', '44'), (7, 'p7', '77'), (9, 'p9', '99')]

What you want is to only get the members of the tuple at a particular position i.e.

if i 1 = 3 which is at position 0 of str1, then only get values of zipped[0]

if i 1 = 4 which is at position 1 of str1, then only get values of zipped[1]

Try

    <!-- first convert to a list -->
    {% set k = zipped|list %}

        {% for i in range(0,10) %}<br>
            {% if i 1 in str1|list %}
                <!-- find the position of i   1 -->
                {% set j = str1.index(i 1) %}
                <!-- get the value at that position -->
                {% set l = k[j] %}
                
            <option value="{{ i 1 }}">  {{ i 1 }} : {{ l[0] }} {{ l[1] }} {{l[2]}}</option>
                    
           {% else %}
                <option value="{{ i 1 }}"> {{ i 1 }} : </option>
           {% endif %}

        {% endfor %}

Tested this and got

3 : 3 p3 33

4 : 4 p4 44

7 : 7 p7 77

CodePudding user response：

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 -%}