如何从输入数据创建二维列表? [英] How to create a 2d list from a input data?

问题描述

我正在尝试

n = int(input())
m = int(input())
print(n,m)
for i in range(0,n):
    for j in range(0,m):
        ar[i][j] = int(input())
for i in range(0,n):
    for j in range(0,m):
        print (ar[i][j])

但是它显示了一个错误

Traceback (most recent call last):
  File "C:/Users/shivansh/Desktop/test.py", line 6, in <module>
    ar[i][j] = int(input())
NameError: name 'ar' is not defined

我曾经用C语言做过同样的事情，但是它可以工作.那么，如何在Python中做到这一点?

I used to do the same in C language but it works. So, how to this in Python?

推荐答案

您尚未声明ar.在Python中，您不必执行单独的声明和初始化.但是，您不能对willn-nilly名称进行操作.

You haven't declared ar yet. In Python, you don't have to perform separate declaration and initialization; nevertheless, you can't perform operations on names willy-nilly.

从这样的东西开始:

ar = [[0 for j in range(m)] for i in range(n)]

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