Sudoku Validator Exercise

sudoku_validiator_exercise.py

# Sudoku Background
# Sudoku is a game played on a 9x9 grid. The goal of the game is to fill all
# cells of the grid with digits from 1 to 9, so that each column, each row,
# and each of the nine 3x3 sub-grids (also known as blocks) contain all of
# the digits from 1 to 9. (More info at: http://en.wikipedia.org/wiki/Sudoku)
#
# Sudoku Solution Validator
# Write a function validSolution/ValidateSolution/valid_solution() that
# accepts a 2D array representing a Sudoku board, and returns true if it is
# a valid solution, or false otherwise. The cells of the sudoku board may also
# contain 0's, which will represent empty cells. Boards containing one or more
# zeroes are considered to be invalid solutions.
#
# The board is always 9 cells by 9 cells, and every cell only contains integers
# from 0 to 9. Examples:

validSolution([
  [5, 3, 4, 6, 7, 8, 9, 1, 2],
  [6, 7, 2, 1, 9, 5, 3, 4, 8],
  [1, 9, 8, 3, 4, 2, 5, 6, 7],
  [8, 5, 9, 7, 6, 1, 4, 2, 3],
  [4, 2, 6, 8, 5, 3, 7, 9, 1],
  [7, 1, 3, 9, 2, 4, 8, 5, 6],
  [9, 6, 1, 5, 3, 7, 2, 8, 4],
  [2, 8, 7, 4, 1, 9, 6, 3, 5],
  [3, 4, 5, 2, 8, 6, 1, 7, 9]
]);
# => true

validSolution([
  [5, 3, 4, 6, 7, 8, 9, 1, 2], 
  [6, 7, 2, 1, 9, 0, 3, 4, 8],
  [1, 0, 0, 3, 4, 2, 5, 6, 0],
  [8, 5, 9, 7, 6, 1, 0, 2, 0],
  [4, 2, 6, 8, 5, 3, 7, 9, 1],
  [7, 1, 3, 9, 2, 4, 8, 5, 6],
  [9, 0, 1, 5, 3, 7, 2, 1, 4],
  [2, 8, 7, 4, 1, 9, 6, 3, 5],
  [3, 0, 0, 4, 8, 1, 1, 7, 9]
]);
# => false

# Source: https://www.codewars.com/kata/529bf0e9bdf7657179000008