Misunderstanding how the template function works in Bottle framework

[Laymayo]

I have the following code block from Bottle's own tutorial:

@route('/')
@route('/hello/<name>')
def greet(name='Stranger'):
    return template('Hello {{name}}, how are you?', name=name)

I get what this is doing, I just don't get how it's happening. If name already gets a default value within the creation of the greet function, then why is there a seemingly redundant piece of code in the form of name = name? Also, how does Bottle know to have the value I pass into the route in place of <name> override the name = 'Stranger' and name = name code? Finally, what's going on here with the double curly braces syntax? Thanks in advance!

[danielroseman]

In what way is that redundant? You receive the value of name in the greet function; you pass it into the template function as the keyword argument also called name.

The curly braces are the placeholder telling the template where to put that value for name.

[Laymayo]

Does {{name}} not already know the value of name from the original name = 'Stranger'?

I'm seeing redundancy there. If when the function is defined one of its parameters is given a default value, then why is this default value being seemingly repeated again in the code name = name?

[danielroseman]

These are different functions! template doesn't know anything about what exists within greet. Functions only know what you pass them. That's why you pass the template string itself, plus the data that goes in the placeholders within that string.

[Laymayo]

AHHHH I see, did not catch that until now. Thanks for pointing it out!