fax.py

# Download the helper library from https://www.twilio.com/docs/python/install
from twilio.rest import Client


# Your Account Sid and Auth Token from twilio.com/console
account_sid = ''
auth_token = ''
client = Client(account_sid, auth_token)

fax = client.fax.faxes \
    .create(
         from_='phone_number',
         to='phone_number',
         media_url='public_url_of_the_pdf_to_attach'
     )

print(fax.sid)