Fetch OHLCV Candles from tickers

main.py

def ticker(exchange, currency):
    try:
        ticker = exchange.fetch_ticker(currency)

        closing = ticker['last']
        timestamp = ticker['timestamp']
        open = ticker['open']
        high = ticker['high']
        low = ticker['low']
        volume = ticker['baseVolume']
        bid = ticker['bid']
        ask = ticker['ask']

        # Check if there is empty values. Sometimes, some apis doesnt have values
        # and this causes problems in database records.

        if not open:
            open = 0
        if not high:
            high = 0
        if not low:
            low = 0
        if not volume:
            volume = 0
        if not bid:
            bid = 0
        if not ask:
            ask = 0

        delta_value = delta(exchange, currency)

        price_delta_1h = delta_value[0]

        price_delta_24h = delta_value[1]

        print(str(exchange.exchangeName) + " " + str(currency) + " Delta 1h: " + str(price_delta_1h))
        print(str(exchange.exchangeName) + " " + str(currency) + " Delta 24h: " + str(price_delta_24h))

        trading_pairs = {
            "trading_pair_id": id_convert(exchange, currency),
            "trading_pair": currency,
            "price": float(closing),
            "price_delta_1h": price_delta_1h,
            "price_delta_24h": price_delta_24h,
            "price_updated_at": timestamp
        }

        database_write(exchange, currency, timestamp, open, high, closing, low, volume, bid, ask)

        sleep(exchange.rateLimit / 1000)
    except (ccxt.ExchangeError, ccxt.AuthenticationError, ccxt.ExchangeNotAvailable, ccxt.RequestTimeout) as error:
        print('Got an error', type(error).__name__, error.args, ', retrying in', hold, 'seconds...')
        sleep(exchange.rateLimit / 1000)
    return trading_pairs