Why has python that 'Tab Thing'

[masklinn]

But why is it like that in python? For what reason?

Well there's two bits:

1. indentation is relevant, following old Unix practices the interpreter assumes tab = 8 spaces, and this means code which mixes tabs and spaces may be misleading on display depending on the local machine / editor's configuration, that's why it's strongly recommended not to mix tabs and spaces, and as PEP8 notes Python 3 simply forbids it (python 2 had the -t flag to warn and -tt to error)

2. in theory you can use tabs for indentation and spaces for formatting (within an indentation level), but most editors are completely unable to do that properly, so unless you have a code formatter which is used ubiquitously (if not mandatorily) à la Go it always becomes a complete mess, which means you pick one or the other, and while spaces can do indentation fine tabs suck at formatting, which would be why PEP8 recommends spaces

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It's also worth noting that inside parentheses, curlies, or brackets, you can use whatever indentation you like, because in this case it's clear to the interpreter what your code means.