[꿀팁] 2차원 배열 선언하기

# 4 * 3 (높이가 가로보다 긴 행렬)
rows = 4
cols = 3
arr = [[0 for j in range(cols)] for i in range(rows)]
'''
[[0, 0, 0], 
[0, 0, 0], 
[0, 0, 0], 
[0, 0, 0]]
'''

rows = 4
cols = 3
arr = [[0]* cols for _ in range(rows)]
print(arr)

n = 9
arr = [[0]*n for _ in range(n)]