NumPy Array: Minesweeper - substituting random items

I am at the beginning of an attempt to make a "minesweeper" game. I have an 8 x 8 array of 0's. I would like to substitute 8 random 0's within the array with the value 1 (to represent "mines"). I have no clue where to begin. Here is my code:

import numpy as np
import sys
import random

a = np.array([(0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0),
             (0, 0, 0, 0, 0, 0, 0, 0)])

for random.item in a:
    item.replace(1)
    print(a)

row = int(input("row "))
column = int(input("column "))

print(a[row - 1, column - 1])

How do I replace 8 random 0's within the array with 1's?