Python索引超出2D列表中的范围

Python索引超出2D列表中的范围,python,list,indexing,range,Python,List,Indexing,Range,我对Python中的多维列表有异议。上述代码打印： target_adds = [] tgt_start = 0 tgt_end = 0 for i in range(len(targets)): start = targets[i][0] length = targets[i][1] start_pkt = math.ceil(start / 512.0) len_off = (length * 2) - 4 samples_left = 512 - (star