views.py

import csv

from django.http import HttpResponse


def serve_report(filename, fieldnames, data):
    """
    Generate a CSV with the passed in `fieldnames` and `data`
    and return a response with it as an attachment as `filename` + .csv
    """
    response = HttpResponse(content_type='text/csv')
    response['Content-Disposition'] = 'attachment; filename="%s.csv"' % filename

    writer = csv.DictWriter(response, fieldnames=fieldnames)
    writer.writeheader()

    if len(data):
        writer.writerows(data)

    return response