def isValidSudoku(self, board: List[List[str]]) -> bool:

"""

import collections

def rowValid(board):

# Booleans checked of each row

valid = []

for row in board:

lst = [x for x in row if (x != '.')]

valid.append(len(lst) == len(set(lst)))

return all(valid)

def colValid(board):

# Booleans checked of each col

valid = []

for i in range(len(board)):

col = []

for j in range(len(board[0])):

if board[j][i] != '.':

col.append(board[j][i])

valid.append(len(col) == len(set(col)))

return all(valid)

def squareValid(board):

# Booleans checked of each col

valid = []

# 3 by 3 spacings

for row in (0, 3, 6):

for col in (0, 3, 6):

# containerize the 3 by 3 grid into a list

square = [board[x][y] for x in range(

row, row + 3) for y in range(col, col + 3) if board[x][y] != '.']

valid.append(len(square) == len(set(square)))

return all(valid)

# Main

return rowValid(board) and colValid(board) and squareValid(board)

def isValidSudoku(self, board):

"""

seen = []

for rowIndex, row in enumerate(board):

for colIndex, val in enumerate(row):

if val != '.':

seen += [(val, colIndex), (rowIndex, val),

(rowIndex/3, colIndex/3, val)]