CSV文件的分拆

import csv
import sys
import os
import imp
import codecs
imp.reload(sys)
csvFile = open('D:\\sk.csv','r',encoding='gb18030',errors = 'ignore')
reader = csv.reader(csvFile)

f1 = open('sk_1.csv','w+', newline='',errors = 'ignore')
f2 = open('sk_2.csv','w+', newline='',errors = 'ignore')
writer1 = csv.writer(f1)
writer2 = csv.writer(f2)

i = 0
for item in reader:
    if i < 322890:
        writer1.writerow(item)
    else:
        writer2.writerow(item)    
    i=i+1
    

csvFile.close()
f1.close()
f2.close()