Django send welcome email after User created using signals - email

Question

I have a create_user_profile signal and I'd like to use same signal to send a welcome email to the user.
This is what I wrote so far in my signals.py:
#receiver(post_save, sender=User)
def update_user_profile(sender, instance, created, **kwargs):
if created:
UserProfile.objects.create(user=instance)
instance.profile.save()
subject = 'Welcome to MyApp!'
from_email = 'no-reply#myapp.com'
to = instance.email
plaintext = get_template('email/welcome.txt')
html = get_template('email/welcome.html')
d = Context({'username': instance.username})
text_content = plaintext.render(d)
html_content = html.render(d)
try:
msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
msg.attach_alternative(html_content, "text/html")
msg.send()
except BadHeaderError:
return HttpResponse('Invalid header found.')
This is failing with this error:
TypeError at /signup/
context must be a dict rather than Context.
pointing to the forms.save in my views.py file.
Can you help me to understand what's wrong here?

Answer 1

Just pass a dict to the render instead of a Context object
d = {'username': instance.username}
text_content = plaintext.render(d)

Answer 2

On django 1.11 the template context must be a dict:
https://docs.djangoproject.com/en/1.11/topics/templates/#django.template.backends.base.Template.render
Try to just remove the Context object creationg.
d = {'username': instance.username}