How to force a new line when appending to a csv using python pandas .to_csv

Question

When appending to csv, my first line is starting on the existing last line rather than a new line.

I keep searching SO, but I am just finding the basic use of openi

Answer 1

If your dataframe gets huge and you want to avoid concatenation you could go with

import csv
with open('foo.csv','ab') as out:
   writer=csv.writer(out)
   writer.writerow(())

in a function or just as a snippet in your code. If you're not on Windows maybe you could avoid adding 'b' in open and open the file with just 'a' (append)