[Equinox]

What does the ,0 do at the end of the first line?

Variables. We can split them with commas.
user1,user2 = 'duubz','.shebang'
You could think of it like a dictionary.
{user1: 'duubz', user2: '.shebang'}
It's basically the same as assigning the variables separately.
user1 = 'duubz
user2 = '.shebang'

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Basically just saves space.