How django render function handles for loop ，how parse a "if" or "for"

{% for name, age in data.items %}
Name: {{name}}, Age: {{age}} <br>
{% endfor %}

for loop in template,when render it,how does django know it is a for loop and show datas on html page.

I know how to use "for loop" in template, and render template&content in view function,but I dont understand how django interprets it. How does the render function handle the for loop in html?I meand how implement it detailedly?

I just read souce code from render function jump to this point:\python3.8\Lib\string.py

enter image description here

for the self.pattern.sufunction just:

@overload
def sub(self, repl: AnyStr, string: AnyStr, count: int = ...) -> AnyStr: ...

so how does django implement it ?

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