preev.py

'''
A small module for getting the prices of bitcoin and litecoin from https://preev.com
Works for both Python 2 and 3. Easily importable and requires only a simple call.
'''
try:
    from urllib import urlopen
except ImportError:
    # py 3
    from urllib.request import urlopen
import json


def _get_avg(data, coin):
    prices = []
    for entry in data[coin]['usd']:
        prices.append(float(data[coin]['usd'][entry]['last']))
    return sum(prices) / len(prices)


def get_data(url):
    resp = urlopen(url)
    content = resp.read()
    try:
        return json.loads(content)
    except TypeError:
        return json.loads(content.decode('utf-8'))

def ltc():
    url = 'http://preev.com/pulse/units:ltc+usd/sources:btce'
    data = get_data(url)
    return round(_get_avg(data, 'ltc'), 2)


def btc():
    url = 'http://preev.com/pulse/units:btc+usd/sources:bitfinex+bitstamp+btce'
    data = get_data(url)
    return round(_get_avg(data, 'btc'), 2)


if __name__ == '__main__':
    print(ltc())
    print(btc())