While Nim is a much better python, you cannot use python modules with Nim (pushing strings to a python interpreter does not count as such), so you need some man-years to build a reasonable software collection.
Haxe had another approach. Create a library and transpile it to be used with Lua/Python/ Java and other options.
Have you seen Nimpy[0]?
It allows for a nice integration between Nim and Python. At least for the examples I have tried, it could be used in place of Cython, when there's a need for extra speed in some hot loops and similar situations.