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

I am assuming that you are going to appending one below other of two dataframe into single dataframe.

use below mentioned command to make it as single command

ans = pd.concat([df, df])

then you can make output into .csv file

Answer 2

I had a similar problem and after a god bit of searching, I didn't find any simple/elegant solution. The minimal fix that worked for me is:

import pandas as pd

with open('foo.csv') as f:
    f.write('\n')    
mydf.to_csv('foo.csv', index = False, header = False, mode='a')

Answer 3

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)