Conditionally adding things to a list in a dbt macro

dbt_jinja_list_adding_control_structure.sql

{% macro test_macro() %}

    {% set contains_1 = [] %}
    {% set contains_2 = [] %}
    {% set my_dict = [{'a': [1]}, {'b': [1, 2]}, {'c': [2]}] %}

    {% for item in my_dict %}
    
        {{ log(item, info=True) }}
        
        {% for key, value in item.items() %}
        
            {% if 1 in value %}
            
                {% do contains_1.append(key) %}
                
            {% endif %}
            
            {% if 2 in value %}
            
                {% do contains_2.append(key) %}
                
            {% endif %}
            
        {% endfor %}
        
    {% endfor %}

    {{ log(contains_1, info=True) }}
    {{ log(contains_2, info=True) }}

{% endmacro %}

terminal.sh

> dbt run-operation test_macro
Running with dbt=0.20.2
{'a': [1]}
{'b': [1, 2]}
{'c': [2]}
['a', 'b']
['b', 'c']