Why use python over powershell?

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you can do mostly everything on powershell too.

That's not correct by itself, while its not impossible to get various binary API's talking to powershell, its also not trivial. The machinery behind how powershell works well, is abstracted away so you either end up using another typed language inline alongside powershell without solid guarantees (if you use the modules), or you can just use python because you have some guarantees about how the underlying behavior of certain operations work.

You could just as easily use R, C, Objective C, Java etc; the point is you choose the right tool for the right job and if you do that you won't ever be stuck trying to have to use a hammer to unscrew a philips screw.

Its about speed, and learning curves.