Save crypto prices to a text file

crypto-prices.py

import requests
import time, datetime
import sys

# find a home for these
directory = 'C://Users//antho//Downloads//Assets//' # include trailing slash, e.g., 'C://Users//antho//Downloads//Assets//'

# get latest price of desired coin from coinmarketcap.com
def get_latest_price(coin):
    response = None
    while response is None:
        try:
            response = requests.get('https://api.coinmarketcap.com/v1/ticker/' + coin)
        except:
            pass
    # i know a guy named json
    response_json = response.json()

    # return rounded float as string
    return str(round(float(response_json[0]['price_usd']),2))

# write price of coin to local file in directory
def write_price_file(coin):
    # get price of coin
    price = "$" + get_latest_price(coin)

    # cmd line output
    print(str(datetime.datetime.now()) + ": " + coin + " price is now " + price + "...")

    # write price to file
    file = open(directory + coin + "-price.txt","w")
    file.write(price)
    file.close()

# announce that we're starting
print("Starting... Press CTRL+C to exit.")
# system clock at start
start = time.time()
# forever, every 60 seconds, until exit
try:
    while True:
        # update price files
        write_price_file('Bitcoin')
        write_price_file('Ethereum')
        write_price_file('Litecoin')
        # etc...

        # now it works
        sys.stdout.flush()

        # sleep tied to system clock for accuracy https://stackoverflow.com/a/25251804
        time.sleep(60.0 - ((time.time() - start) % 60.0))
except KeyboardInterrupt:
    # announce that we're stopping
    print("Stopping...")
except Exception as e:
    # announce any errors
    print("ERROR:", e, file=sys.stderr)
    input("There was an error... Press Enter to exit.")