小编Edg*_*r P的帖子

我有以下代码片段:

d = [[0,558,437,142,45,290], [558,0,232,500,600,523], [437,232,0,408,492,572], 
 [142,500,408,0,180,197], [45,600,492,180,0,254], [290,523,572,197,254,0]]

for row in d:
    for elem in row:
        elem = elem * 2
print d[0][1]
print '\n'

为什么它不打印新值,它仍然打印558