Python Fax via Phaxios

fax.py

#!/usr/bin/env python3
from subprocess import call
import sys

if len(sys.argv) <= 2:
	print("Usage: send_fax NUMBER FILENAME...")
	exit(-1)

number = sys.argv[1]   
api_key = 'put_api_key_here'
api_secret = 'put_api_secret_here'

command_args = [
  "curl",
  "https://api.phaxio.com/v2/faxes",
  "-u '{}:{}'".format(api_key, api_secret),
  "-F 'to={}'".format(number)
]

for file in sys.argv[2:]:
	command_args.append("-F 'file=@{}'".format(file))

call(' '.join(command_args), shell=True)