The Statistics and Calculus with Python Workshop

Appendix

1. Fundamentals of Python

Activity 1.01: Building a Sudoku Solver

Solution

1. First, we define the Solver class to store its input puzzle in its cells attribute, as follows:

   from copy import deepcopy

   class Solver:

       def __init__(self, input_path):

           # Read in the input file and initialize the puzzle

           with open(input_path, 'r') as f:

               lines = f.readlines()

           self.cells = [list(map(int, line.split(','))) \

                         for line in lines]

2. The helper method that prints out the puzzle in a nice format can loop through the individual cells in the puzzle while inserting the separating characters '-' and '|' at the appropriate places:

       # Print out the initial puzzle or solution in a nice format.

       def display_cell(self): ...