求教列表推导式相关，求矩阵转置哪里有问题

kun123321

matrix = [[1, 2, 3, 4],
          [5, 6, 7, 8],
          [9, 10, 11, 12]]
Tmatrix = [matrix[col][row] for row in matrix for col in range(4)]
print(Tmatrix)

isdkz

matrix = [[1, 2, 3, 4],
          [5, 6, 7, 8],
          [9, 10, 11, 12]]
Tmatrix = [[matrix[row][col] for row in range(3)] for col in range(4)]
print(Tmatrix)