Python: writing file and using buffer - django

Question

I'm using django to generate personalized file, but while doing so a file is generated, and in terms of space using it is quite a poor thing to do.
this is how i do it right now:
with open(filename, 'wb') as f:
pdf.write(f) #pdf is an object of pyPDF2 library
with open(filename, 'rb') as f:
return send_file(data=f, filename=filename) #send_file is a HTTPResponse parametted to download file data
So in the code above a file is generated.
The easy fix would be to deleted the file after downloading it, but i remember in java using stream object to handle this case.
Is it possible to do so in Python?
EDIT:
def send_file(data, filename, mimetype=None, force_download=False):
disposition = 'attachment' if force_download else 'inline'
filename = os.path.basename(filename)
response = HttpResponse(data, content_type=mimetype or 'application/octet-stream')
response['Content-Disposition'] = '%s; filename="%s"' % (disposition, filename)
return response

Answer 1

Without knowing the exact details of the pdf.write and send_file functions, I expect in both cases they will take an object that conforms to the BinaryIO interface. So, you could try using a BytesIO to store the content in an in-memory buffer, rather than writing out to a file:
with io.BytesIO() as buf:
pdf.write(buf)
buf.seek(0)
send_file(data=buf, filename=filename)
Depending on the exact nature of the above-mentioned functions, YMMV.