Deserializer for Sudoku

Sudoku Deserializer

import numpy as np

def deserialize_sudoku(serialized):
    """
    a b c d e f g h i
    j k l . . . . . .
    . . . . . . . . .
    would be from
    abcdefghijkl...
    """
    serialized = serialized.replace(",", "")
    if len(serialized) != 9*9:
        print("Wrong length")
        print(9*9 - len(serialized))
        return False
    deserialized = np.zeros([9, 9], dtype=list)
    for i in range(9):
        for j in range(9):
            val = int(serialized[9*j + i])
            if val == 0:
                deserialized[i, j] = [1, 2, 3, 4, 5, 6, 7, 8, 9]
            else:
                deserialized[i, j] = val
    return deserialized
    
hardest = deserialize_sudoku("800000000,003600000,070090200" +
                             "050007000,000045700,000100030" +
                             "001000068,008500010,090000400")