exchange_rates.py

import urllib2
import sys

def get_exchange(curr_from, curr_to, api_key):
	
	url = 'https://www.exchangerate-api.com/{a}/{b}?k={key}'.format(a=curr_from, b=curr_to, key=api_key)

	try:
		api_req = urllib2.urlopen(url)
		rate = api_req.readline().strip()
		return rate

	except Exception, e:
		return None

def get_rate():
	print "enter API key: "
	api_key = sys.stdin.readline().strip()
	currencies = []
	with open("currency_codes.txt",'r') as curr:
		for line in curr:
			codes = line.split('\t')
			currencies.append(codes[2].strip('\n'))


	# with open("graph_edges.txt", 'w') as edges:
	# 	for curr_from in currencies:
	# 		for curr_to in currencies:
	# 			if curr_to == curr_from:
	# 				continue

	# 			exch = get_exchange(curr_from, curr_to, api_key)
			
	# 			if exch != None:
	# 				exch = float(exch)
	# 				edges.write('%s %s %.6f\n' %(currencies.index(curr_from), currencies.index(curr_to),exch))
	# 				print ("%s, %s, %.6f" %(curr_from,curr_to, exch))
	# 			else:
	# 				continue
	return currencies