Nim is not really 'pythonic'. It does have some superficial similarity with Python (being whitespace sensitive) but it begins to diverge pretty soon. This is not really a criticism of Nim. I quite like many of the choices in Nim.

Seq claims that vast majority of python programs would work as is. I have not validated that claim, but Nim can absolutely not make that claim. Any python library would require substantial porting effort to be translated to nim.