This Sudoku-Solver was one I'd built as a simple numpy experiment quite a while back, but I thought why not use it as a simple example of how to create a large project (that may optionally have large dataset(s)).
The dataset is from Kaggle.
Oofone/SudokuExample
A simple example project that I'll use to explain how to structure and approach large projects with multiple modules and even data-sets. Note: The example is fully functional, the sudoku-solver can actually solve puzzles.
PythonMIT