Adding header line to export csv in Python -

i want add header line final output csv python. how can that? first removing header of main file items.csv because @ end python adds 'target' word header too. after adding word want write new header.

here code:

import csv itertools import islice import os  open('items.csv') sample, open('items_50.csv', "w") out:     csv1=csv.reader(sample)     header = next(csv1, none)     csv_writer = csv.writer(out)     sirali = sorted(csv1, key=lambda x:int(x[0]), reverse=true)     csv_writer.writerows(islice(sirali,50))   file1=open('items_50.csv','rb')  readfile=csv.reader(file1,) file2=open('final.csv','wb') writefile=csv.writer(file2,delimiter='"') result=()   row in readfile:        result= [row[0]+','+row[1]+','+row[2]+','+row[3]+'target']     writefile.writerow(result)  file1.close() file2.close() 

an example final.csv right now:

0,apple,orange,gettarget 25,steven,jack,sendtarget 33,pencil,book,sendtarget 8,notebook,cellphone,gettarget 

i want make this:

count,thing,owner,action 0,apple,orange,gettarget 25,steven,jack,sendtarget 33,pencil,book,sendtarget 8,notebook,cellphone,gettarget 

thank you.

do befor for loop:

writefile.writerow(["count", "thing", "owner", "action"]) 

btw: can do

for row in readfile:     row[3] += 'target'      writefile.writerow(row)