Why in this code fragment are passed 2 arguments when the function should only take 1?

Watch the lessons on the Flask. https://youtu.be/PSWf2TjTGNY
And I'm a little unclear why the author of the lesson passes in a function user_posts two arguments (the username and page) in 28:43, when the function should only accept username as argument (see 25:18)? And why is this working?
April 3rd 20 at 17:20
1 answer
April 3rd 20 at 17:22
From these findings? Look again at the code, if you do not understand, look to insight. That will be your lesson.

Spoiler hint, but you better realize yourself and don't spy on me.
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DON'T SPY ON ME!

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Seriously, little to catch up with to a simple thing? TYZH PROGRAMMER!

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No no no, not so simple.

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gkdos, and who said that it would be easy?

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The answer was there, but try again

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no

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and there is no

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ku ku
And that is why I, who understand how it works - poked the spoilers???? - Chelsie_Dietrich commented on April 3rd 20 at 17:25
@Chelsie_Dietrich, if you know, please explain - Salma_Orn commented on April 3rd 20 at 17:28

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