python - Use Flask to convert a Pandas dataframe to CSV and serve a download

Question

I have a Pandas dataframe in my Flask app that I want to return as a CSV file.

return Response(df.to_csv())

The problem is that the output appears in the browser instead of downloading as a separate file. How can I change that?

I tried the following as well but it just gave empty output.

response = make_response(df.to_csv())
response.headers['Content-Type'] = 'text/csv'
return Response(response)

Answer 1

Set the Content-Disposition to tell the browser to download the file instead of showing its content on the page.

resp = make_response(df.to_csv())
resp.headers["Content-Disposition"] = "attachment; filename=export.csv"
resp.headers["Content-Type"] = "text/csv"
return resp