Mr. Rumpf, why didn't you went along with the Python standard library?

[NameUndefined]

Because Nim is not meant to be a compilable python, but if you still need some 
of python modules or functions there may be rewrites somewhere on the internet. 
For instance Narimiran ported the 
[itertools](https://github.com/narimiran/itertools) python module to nim.