如何使用Python在网格中创建10个随机x，y坐标

Question

我需要创建一个8x8网格，并在网格上随机分配10个硬币。我面临的问题是randint函数有时会生成相同的随机坐标，因此只有9或8个硬币生成并放置在网格上。我怎样才能确保这不会发生？干杯：）这是我目前的密码：

from random import randint

grid = []
#Create a 8x8 grid
for row in range(8):
    grid.append([])
    for col in range(8):
        grid[row].append("0")

#create 10 random treasure chests
    #problem is that it might generate the same co-ordinates and therefore not enough coins
for coins in range(10):
    c_x = randint(0, len(grid)-1)
    c_y = randint(0, len(grid[0])-1)
    while c_x == 7 and c_y == 0:
           c_x = randint(0, len(grid)-1)
           c_y = randint(0, len(grid[0])-1)
    else:
        grid[c_x][c_y] = "C"

for row in grid:
print(" ".join(row))

我已经包括了一段时间/其他-因为网格左下角一定没有硬币