Django - How to do tuple unpacking in a template 'for' loop

[ Product_Type_1, [ product_1, product_2 ],
  Product_Type_2, [ product_3, product_4 ]]

for product_type, products in list:
    print product_type
    for product in products:
        print product

{% for product_type, products in product_list %}
    print product_type
    {% for product in products %}
        print product
    {% endfor %}
{% endfor %}

[ (Product_Type_1, ( product_1, product_2 )),
   (Product_Type_2, ( product_3, product_4 )) ]

{% for product_type, products in product_type_list %}
    {{ product_type }}
    {% for product in products %}
        {{ product }}
    {% endfor %}
{% endfor %}

mylst = [(a, b, c), (x, y, z), (l, m, n)],

{% for item in mylst %}
     {{ item.0 }} {{ item.1}} {{ item.2 }}
{% endfor %}

{% for product_type in product_type_list %}
    {{ product_type }}
    {% for product in product_type.products.all %}
        {{ product }}
    {% endfor %}
{% endfor %}

{% for product_type, products in product_list.items %}
    print product_type
    {% for product in products %}
        print product
    {% endfor %}
{% endfor %}