I'm not the author, but I think this is an interesting story and it seems nobody mentioned it here.
https://www.reddit.com/r/nim/comments/1ms75pv/rewrite_in_nim/
The author shared his experience in the reply:
Whenever I was porting 'vanilla' Python to Nim, I had a very pleasant experience because Nim has so many nice high-level abstractions that map to how I was using Python. Unless I had a "type: ignore" in the Python source, I was never forced to re-architect my design, and even if it did I just had to tweak it a bit.
With that being said, rewriting auto-editor to Nim was not a fun experience because I could never get Python and Nim code to talk to each other at any point of the project. Rewriting every function by hand, even if the languages are very similar semantically, is time-consuming. https://github.com/Pebaz/nimporter being abandoned was the biggest obsolete/disappointment for me and made me ponder using Rust instead because I know PyO3 is rock-solid. I think the turning point was sometime in late 2024/2025, LLMs became awesome at writing Nim code, which meant the pain of rewriting was massively reduced.
Nimporter has been deprecated for a while now.
Everything you need is need is in Nimpy