Panda’s Write CSV – Append vs. Write

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Not sure there is a way in pandas but checking if the file exists would be a simple approach:

import os
# if file does not exist write header 
if not os.path.isfile('filename.csv'):
   df.to_csv('filename.csv', header="column_names")
else: # else it exists so append without writing the header
   df.to_csv('filename.csv', mode="a", header=False)

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