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...