2차원 리스트의 생성과 접근

input

a=[0]*10
print(a)

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a=[[0]*3 for_in range(3)]
print(a)
a[1][1] = 2

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for x in a:
print(x)

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for x in a:
for y in x:
print(y, end=' ')
print()

result

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

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[[0,0,0], [0,0,0], [0,0,0]] #2차원 리스트이므로 앞이 행번호 뒤가 열번호 이다.

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[[0,0,0], [0,2,0], [0,0,0]]

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[0,0,0][0,2,0]
[0,0,0]

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0 0 0
0 2 0
0 0 0