append data to csv file python in loop code example

Example 1: append to csv python

with open('document.csv','a') as fd:
    fd.write(myCsvRow)

Example 2: python csv add row

import csv   

fields=['first','second','third']

with open(r'name', 'a') as f:
    writer = csv.writer(f)
    writer.writerow(fields)