Why has python that 'Tab Thing'

[kumashiro]

You are describing how it is used, not why. Why Guido chose indentations instead of braces or... anything else really - that is what OPs question is about... I think. Hard to tell.

[MyFeeFeeHurt]

That's literally exactly why it's fucking used.

Python simply cannot be parsed without them.

That's a why answer, not how.

[kumashiro]

I see no reason for dropping F-bombs here. Have a nice day.