I have an app that takes in some information, performs some calculations using pandas, and turns the final pandas data frame into a CSV that is then downloaded using the Flask app. How do I download multiple CSVs within one view? It seems that I can only return a single response at a time.
An example snippet:
def serve_csv(dataframe,filename):
buffer = StringIO.StringIO()
dataframe.to_csv(buffer, encoding='utf-8', index=False)
buffer.seek(0)
return send_file(buffer,
attachment_filename=filename,
mimetype='text/csv')
def make_calculation(arg1, arg2):
'''Does some calculations.
input: arg1 - string, arg2- string
returns: a pandas data frame'''
@app.route('test_app', methods=['GET', 'POST'])
def test_app():
form = Form1()
if form.validate_on_submit():
calculated_dataframe = make_calculation(str(form.input_1.data), str(form.input_2.data))
return serve_csv(calculated_dataframe, 'Your_final_output.csv')
return render_template('test_app.html', form=form)
So let's say in that example above that make_calculation
returned two pandas data frames. How would I print both of them to a CSV?
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