add row to existing csv file in python -

i want use function add row of information existing csv file.

friend_info tuple including [name, address, phone, dob]

i have code

def add_friend(friend_info, friends_list):     open(friends_list, 'a') fapp:         writer = csv.writer(fapp)         writer.writerow(friend_info) 

for reason code adding last line of csv (i want start on new line)

i don't think csv writer object smart enough know it's appending onto existing csv data. you're giving file object , telling put new csv data file, starts writing can. start new row, need read existing data in first, append new row(s), write out.