Better way to read files?

[rjaus]

XeroPhaxio/service.py

Line 48 in 30e85a2

# Save the PDF retrieved to disk temporarily. This is probably unnecessary, but I'm a Python Noob.

@jnankin

I'm new to Python, but it seems like everything is expecting to read a file from disk. I've retrieved the PDF file from the API, is there a cleaner way to read it into the Phaxio object as a 'file', rather than writing it to disk and then reading it back?