These are raw Python 3 bindings which are used the same as you would in C! If you are looking for a seamless integration between Pyhon 3 and Nim, check out yglukhov's excellent library 
.
Nim wrapper for the Python 3 programming language.
Can be used to link either statically or dynamically to the Python 3 interpreter.
There are now three new flags that are used to select the binding type:
- py3_version: This is a required flag that selects the Python version you wish to compile for. Omitting this flag produces a compile time error.
- py3_static: This flag selects the bindings to be compiled statically. Static bindings are usually used when you are creating a Nim module that will be imported in Python.
- py3_dynamic: This flag selects the bindings to be compiled dynamically. Dynamic bindings are used when a Nim application wants to use Python functionality during runtime. A dynamic Python 3 shared library is required to be installed on the system to dynamic bindings (python3.dll on Windows or libpython3.X.so.1/libpython3.Xm.so.1 on Linux/MacOS).
Flags py3_static and py3_dynamic are mutually exclusive!
An example of building a static module for importing into Python:
nim c my_py3_module.nim -d:py3_version:3.5 -d:py3_static
Compatible with Python 3.1 to 3.6 (Examples tested with Python 3.4).