In the following code b1 and b2 give the same output
b1 = [[-1]*3 for _ in range(3)]
b2= [[-1] * 3] * 3
Output
b1 = [[-1, -1, -1], [-1, -1, -1], [-1, -1, -1]]
b2 = [[-1, -1, -1], [-1, -1, -1], [-1, -1, -1]]
But after performing a simple operation -
i = 0
j = 0
b1[i][j] = 1
b2[i][j] = 1
Output
b1 = [[1, -1, -1], [-1, -1, -1], [-1, -1, -1]]
b2 = [[1, -1, -1], [1, -1, -1], [1, -1, -1]]
Why is the first element in every row getting changed in b2 on changing just one value?
