Python 3 command line interface to http://upcdatabase.com

upcdb.py

#!/usr/bin/env python3

import os, sys
import xmlrpc.client

rpc_key = '...' # replace with your RPC Key from http://upcdatabase.com/user

server = xmlrpc.client.ServerProxy('http://www.upcdatabase.com/xmlrpc')

lookup_keys = {12: 'upc', 13: 'ean'}

def print_usage():
	print("Usage: %s <upc|ean> | <method> <key1> <value1> [<key2> <value2> ...]" % (sys.argv[0],))

if __name__ == '__main__':
	if rpc_key == "...":
		print("Error: Please edit this script to add your RPC Key")
		print()
		print("Hint: %s %s" % (os.environ['EDITOR'] or 'vim', __file__))
		sys.exit(-1)
		
	elif len(sys.argv) < 2:
		print_usage()
		print()
		print("Stuck? Try: %s help" % (sys.argv[0],))
		sys.exit(-2)
	
	elif len(sys.argv) == 2 and sys.argv[1] in ('-h', '--help', 'help', '--version', '--usage'):
		print_usage()
		print()
		print("This utility substitutes your RPC key for you. Here's some help from the server detailing the available methods:")
		print()
		print(server.help({'rpc_key': rpc_key})['help'].strip())

	else:
		if len(sys.argv) == 2 and sys.argv[1].isdigit() and len(sys.argv[1]) in lookup_keys:
			method = 'lookup'
			params = {lookup_keys[len(sys.argv[1])]: sys.argv[1]}
		else:
			method = sys.argv[1]
			params = dict(zip(sys.argv[2::2], sys.argv[3::2]))
		
		params['rpc_key'] = rpc_key

		try:
			response = getattr(server, method)(params)
			
		except xmlrpc.client.Error as error:
			print("Fault %s: %s" % (error.faultCode, error.faultString.strip()))
			sys.exit(1)
			
		except xmlrpc.client.Error as error:
			print("Error:", error, repr(error.args))
			sys.exit(2)

		for key in response:
			print("%s: %s" % (key, response[key]))
		if 'status' in response and response['status'] == 'fail':
			sys.exit(3)