Ask HN: Why is there not unsupervised anomaly detection module in python

Hi Folks, I just asked me the question tons of times. Why it seems to be that there is no real unsupervised anomaly detection library in python. Aren't these techniques used anymore, or is there simply nobody thinking about implementing this?

I'm thinking about some algorithms as shown here https://en.wikipedia.org/wiki/Anomaly_detection

Looking forward to your opinions.