pandas DataFrame output end of csv

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You can append using to_csv by passing a file which is open in append mode:

with open(file_name, 'a') as f:
    df.to_csv(f, header=False)

Use header=None, so as not to append the column names.

In fact, pandas has a wrapper to do this in to_csv using the mode argument (see Joe’s answer):

df.to_csv(f, mode="a", header=False)

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