Python script to query the lastes BTC price.

btc_price.py

#!/usr/bin/env python3

import requests
from datetime import datetime

TICKER_API_URL = 'https://api.coinmarketcap.com/v1/ticker/'

def get_latest_crypto_price(crypto='bitcoin'):                                                                                                                                                              
    return float(requests.get(TICKER_API_URL+crypto).json()[0]['price_usd'])


if __name__ == '__main__':
    last_price = -1
    while True:
        price = get_latest_crypto_price()
        now = datetime.now()
        now.strftime("%Y-%m-%d %H:%M:%S")
        if price != last_price:
            print(now, ', BTC price: {} USD'.format(price))
            last_price = price