Email attachment with file upload in django

I need to send a request.FILES file from a File field as an attachment in the email. I'm following a topic that teaches this, but it's not working out.

Django for my project is 1.5

I'm doing the following:

def send_templated_email(subject, email_template_name, email_context, recipients, 
                    sender=None, bcc=None, reply_to=None, fail_silently=True, files=None):

from django.core.mail import EmailMultiAlternatives
from django.template import loader, Context
from django.utils.html import strip_tags

c = Context(email_context)
if not sender:
    sender = settings.DEFAULT_FROM_EMAIL

template = loader.get_template(email_template_name)

text_part = strip_tags(template.render(c))
html_part = template.render(c)

if reply_to:
    headers = {'Reply-To': reply_to}
else:
    headers = {}

if type(recipients) == str:
    if recipients.find(','):
        recipients = recipients.split(',')
elif type(recipients) != list:
    recipients = [recipients,]

msg = EmailMultiAlternatives(subject,
                            text_part,
                            sender,
                            recipients,
                            bcc=bcc,
                            headers=headers)
# if files:
#     if type(files) != list:
#         files = [files,]

#     for f in files:
#         msg.attach_file(f)

if files:
    msg.attach(files.name, files.read(), files.content_type)

msg.attach_alternative(html_part, "text/html")

return msg.send(fail_silently)

In practice the part of the attachment is this that I will highlight:

msg.attach(files.name, files.read(), files.content_type)

Being in files I'm passing request.FILES ['attachment']

The email is sent successfully, however in the place of the body the read of the file appears:

JVBERi0xLjcKJeLjz9MKOCAwIG9iago8PAovRmlsdGVyIC9GbGF0ZURlY29kZQovTiAzCi9BbHRlcm5hdGUgL0RldmljZVJHQgovTGVuZ3RoIDI1OTMKPj4Kc3RyZWFtCnicnZZ3VFTXFofPvXd6oc0w dBh6r1IGEOkdpFdRGGYGG....

I've also tried attach_file, but the result is the same.