[英]IndexError: list index out of range in matrix printing
in_num=int(input())
n_list=[[0 for x in range(in_num) for y in range(in_num)]]
print(n_list)
for row in range(in_num):
for col in range(in_num):
print(n_list[row][col],end='\t')
print()
When I run this code I get:当我运行此代码时,我得到:
5
[[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
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
<ipython-input-10-ef7ccb495ef4> in <module>
4 for row in range(in_num):
5 for col in range(in_num):
----> 6 print(n_list[row][col],end='\t')
7 print()
IndexError: list index out of range
Why I am getting this error and how can I recover this error?为什么会出现此错误以及如何恢复此错误?
Hope this helps!希望这可以帮助!
can you update the following?你能更新以下内容吗?
n_list = [[0 for x in range(in_num) for y in range(in_num)]]
To below到下面
n_list = [[0 for x in range(in_num)] for y in range(in_num)]
Explanation: IMO, you are trying to create a 2D Matrix of zero's but you ended up creating a simple nested list of 1 element.说明:IMO,您正在尝试创建一个 0 的 2D 矩阵,但最终创建了一个包含 1 个元素的简单嵌套列表。
Instead of [[0, 0], [0, 0]] you are creating [[0, 0, 0, 0]].您创建的是 [[0, 0, 0, 0]],而不是 [[0, 0], [0, 0]]。 In this second output, the shape is this is 1 X 4 where as the first has 2 X 2.
在第二个输出中,形状是 1 X 4,而第一个是 2 X 2。
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