関連ワード:  python get row of 2d array    python get column of 2d array    python get first row of 2d array    python get first column of 2d array    python get 2nd column of 2d array    python get last column of 2d array    python get number of rows in 2d array    python column of 2d array    python sum rows of 2d array    get last row of 2d array python