pandas将csv按固定行分割成若干文件

import pandas as pd
import math
df =pd.read_excel("./static/input/2015-2017_RADI.xls")
print(df)
rows,cols=df.shape
split_num =12
value =math.floor(rows/split_num)
rows_format =value*split_num
new_list =[[i,i+split_num] for i in range(0,rows_format,split_num)]

for i_j in new_list:
    i,j =i_j
    excel_small =df[i:j]
    excel_small.to_excel('2015-2017_RADI_{0}_{1}.xls'.format(i,j),index=False)
    df[rows_format:].to_excel('2015-2017_RADI_last.xls')