leetcode 2022. Convert 1D Array Into 2D Array

class Solution:
    def construct2DArray(self, original: List[int], m: int, n: int) -> List[List[int]]:
        output=[]
        n_original=len(original)
        if n_original/m != n :
            return output
        else :
            for i in range(m):
                tmp_list=[]
                for j in range(n):
                    tmp_list.append(original[n*i+j])
                output.append(tmp_list)
            return output