پیام def _sum_of_columns_sample_(sample_list):

def _sum_of_columns_sample_(sample_list): cols = len(sample_list[0]) mylist = [] for c in range(cols): column_sum = 0 for row in sample_list: column_sum += row[c] mylist.append(column_sum) return mylist sample_list = [[18,19,20],[12,8.75,18],[12,14,15.5]] print (_sum_of_columns_sample_(sample_list))