Panda's Write CSV - Append vs. Write

Question

I would like to use pd.write_csv to write \"filename\" (with headers) if \"filename\" doesn\'t exist, otherwise to append to \"filename\" if it exists. If I simply use co

Answer 1

with open(filename, 'a') as f:
    df.to_csv(f, mode='a', header=f.tell()==0)

it will add header when writes to the file first time