​ LVector[l/6] +=1 为何报错？

代码如下：

for oneRow in range(rowcnt):

for  oneCol in range(colcnt):

r, g, b = ndarr[oneRow][oneCol]

h, s, v = colorsys.rgb_to_hsv(r/255, g/255, b/255)

h = h * 360

l = self._hsv2L(h, s, v)

LVector[l/6] +=1

lsum  =sum(LVector)

result = [v * 1.0/lsum for v in LVector]

代码报错如下：

 LVector[l/6] +=1

TypeError: list indices must be integers or slices, not float