Container Tags Question about jinja2-simple-tags

[pix666]

I do not quite understand the purpose of such a design. This looks like an alternative {% if ... %} ... {% else %} tag.
Perhaps this example will help you:

from jinja2 import nodes
from jinja2_simple_tags import BaseTemplateTag

class YetAnotherIfTag(BaseTemplateTag):
    tags = {"if2"}

    def render(self, value):
        # Some logic here...
        return bool(value)

    def output(self, parser, call_node, target, tag_name, lineno):
        body = parser.parse_statements(["name:else", "name:end%s" % tag_name])
        else_ = []
        token = next(parser.stream)
        if token.test("name:else"):
            else_ = parser.parse_statements(["name:end%s" % tag_name], drop_needle=True)

        if_node = nodes.If(call_node, body, [], else_).set_lineno(lineno)
        if target:
            target_node = nodes.Name(target, "store", lineno=lineno)
            return nodes.AssignBlock(target_node, None, [if_node], lineno=lineno)
        return if_node

Usage:

{% if2 26 % 2 == 0 %}
  <p>Number is even</p>
{% else %}
  <p>Number is odd</p>
{% endif2 %}


{% if2 True %}
  <p>Definitely true</p>
{% endif2 %}


<!-- It's funny, but assignment will work too -->
{% if2 True as result %}
  <p>Hello, world!</p>
{% endif2 %}

{{ result }}