medium_puzzles.py

def medium1():
    puzzle = [[2, 7, 3, 0, 0, 0, 0, 8, 5],
              [0, 0, 1, 8, 0, 0, 0, 7, 0],
              [5, 0, 0, 0, 0, 0, 0, 0, 1],
              [0, 0, 0, 0, 8, 9, 0, 4, 0],
              [0, 0, 8, 0, 6, 5, 0, 3, 7],
              [4, 0, 7, 0, 0, 2, 8, 5, 0],
              [3, 5, 0, 1, 7, 0, 0, 2, 4],
              [0, 0, 0, 0, 0, 0, 7, 1, 0],
              [7, 0, 0, 9, 0, 3, 0, 6, 8]]
    return puzzle

def medium2():
    puzzle = [[3, 5, 6, 0, 8, 0, 9, 0, 1],
              [2, 0, 0, 1, 0, 3, 7, 5, 6],
              [9, 1, 7, 0, 0, 0, 0, 0, 8],
              [4, 8, 0, 6, 0, 0, 3, 0, 0],
              [0, 0, 0, 8, 3, 0, 1, 0, 0],
              [0, 3, 0, 0, 0, 2, 6, 8, 5],
              [5, 6, 4, 0, 0, 9, 8, 1, 0],
              [0, 0, 0, 0, 1, 0, 0, 0, 0],
              [0, 0, 0, 4, 0, 0, 0, 0, 7]]
    return puzzle


def medium3():
    puzzle = [[9, 6, 2, 0, 4, 0, 0, 7, 0],
              [7, 0, 0, 1, 0, 0, 0, 2, 0],
              [3, 5, 1, 8, 0, 2, 9, 6, 4],
              [0, 0, 3, 7, 8, 4, 0, 1, 0],
              [8, 1, 0, 0, 0, 6, 0, 0, 7],
              [0, 0, 7, 0, 0, 5, 0, 8, 2],
              [0, 0, 0, 9, 0, 0, 0, 4, 0],
              [4, 0, 0, 0, 0, 0, 0, 0, 5],
              [0, 7, 5, 0, 0, 0, 0, 0, 0]]
    return puzzle

def medium4():
    puzzle = [[5, 0, 0, 0, 0, 0, 7, 8, 0],
              [0, 0, 0, 8, 0, 0, 0, 1, 0],
              [0, 3, 7, 0, 1, 0, 9, 0, 0],
              [0, 0, 0, 1, 0, 0, 6, 0, 8],
              [9, 8, 0, 3, 2, 6, 0, 0, 0],
              [0, 0, 3, 0, 0, 0, 0, 9, 0],
              [3, 0, 0, 0, 6, 4, 0, 5, 9],
              [0, 7, 9, 2, 5, 0, 3, 4, 0],
              [6, 0, 4, 9, 3, 0, 0, 2, 0]]
    return puzzle