你安装了python吗？

import pandas as pd
for i,chunk in enumerate(pd.read_csv('C:/your_path_here/main.csv', chunksize=1000000)):
    chunk.to_csv('chunk{}.csv'.format(i))

或

import os
os.getcwd()

csvfile = open('C:/your_path/Book1.csv', 'r').readlines()
filename = 1
for i in range(len(csvfile)):
    if i % 1000000 == 0:
        open(str(filename) + '.csv', 'w+').writelines(csvfile[i:i+1000000])
        filename += 1

你可以这样做http://docs.cascading.org/cascading/2.5/javadoc/cascading/tap/hadoop/partitiontap.html 以及实施 Partition 指定如何从 TupleEntry 到特定的子目录。