[python] 정해진 사이즈의 2d list 만들기

https://stackoverflow.com/questions/2397141/how-to-initialize-a-two-dimensional-array-in-python

How to initialize a two-dimensional array in Python?

x = [[0 for i in range(Nc)] for j in range(Nr)] #making Nr*Nc matrix (2d array)

In [1]: Nc = 5; Nr = 3

In [2]: x = [[0 for i in range(Nc)] for j in range(Nr)]

In [3]: x

Out[3]: [[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]

In [4]: x[1] 

Out[4]: [0, 0, 0, 0, 0]