size = 10
table = [[0] * size] * size
for iter in range(size):
table[iter][iter] = 9
for iter in range(size):
print(table[iter])我试图使所有对角线元素为 9，但它使所有元素为 9。
回答1
尝试使用嵌套列表推导来初始化 table：
size = 10
table = [[0 for _ in range(size)] for _ in range(size)]
for i in range(size):
table[i][i] = 9
for row in table:
print(row)输出：
[9, 0, 0, 0, 0, 0, 0, 0, 0, 0]
[0, 9, 0, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 9, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 9, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 9, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 9, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 9, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 9, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 9, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 9]