USD to INR Currency Exchange Scraping

CurrencyExchange.py

import requests
import re
from bs4 import BeautifulSoup
from decimal import Decimal


def USD_to_INR(USD):
	'''
		- Retrieve last updated and convertion from db
		- If latest update is less than 24 hours then make is_latest True
	'''
	is_latest = False
	exchange_rate = 1
	if not is_latest:
		r = requests.get('http://www.xe.com/currencyconverter/convert/?Amount=1&From=USD&To=INR',headers={'User-agent': 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36'})
		soup = BeautifulSoup(r.content,"lxml")
		price_tag = soup.find("table",{"class":"ucc-result-table"}).find('td',{'class':'rightCol'})
		exchange_rate = Decimal(re.findall("\d+\.\d+",price_tag.text)[0])
		# TODO: Save the exhange_rate in db.
	return "{0:.2f}".format(USD * exchange_rate)
print USD_to_INR(100)