Sending a graph via send_mass_mail()?

Question

Django

Hello!
There was a need to automatically send the collected data on the site to e-mail.
The data looks like (date - digit).
On the site itself, I attached a chart (bar-chart from highcharts).
Attention, the question is, how to attach a chart to a report letter?

Answer 1

1) save to a file (jpeg or, better yet, pdf, or xls but xs how it works with the correctness of the diagram)
2) send attachments