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There was some interest in getting this to work with ZSH when I first posted it. I just pushed a small change that makes it work for ZSH, and thought people might want to know.
What's the performance impact of starting up a python script every time the shell needs to show the prompt?
On my machine:

real 0m0.075s

user 0m0.047s

sys 0m0.024s

This seems to be a common concern, but I've never noticed a delay in practice.