Python循环函数下标越界求助！

for i in range(1,1590):
    for j in range(0,24):
        data2.iloc[j+24*(i-1),1] = data1.iloc[j,i]


i值超过1580时，就开始出现下面报错，比1580小运行正常：IndexError: single positional indexer is out-of-bounds