A Python module is an external class or set of functions that exist outside the main file of your program. This can be something that you built yourself, or it can be provided by the community.

Python code “sees” compiled Cython code as just another module, so you don’t need to do anything special other than import the compiled module and run its functions. Finally, add a file ...

either across an entire module or only on select functions. Cython also allows you to natively access Python structures that use the buffer protocol for direct access to data stored in memory ...