Crypto price ticker with the inkyphat eink display

inkyphat-crypto-ticker.py

#!/usr/bin/env python3
import cryptocompare
from time import sleep
from inky import InkyPHAT
from random import shuffle
from datetime import datetime
from PIL import Image, ImageDraw, ImageColor, ImageFont

def log(msg):
    #print(msg)
    open('ticker.log', 'a+').write(f'{msg}\n')

def main():
    inkyphat = InkyPHAT('black')

    # Load font file
    font = ImageFont.truetype('/home/pi/fonts/Roboto-Bold.ttf', 22)

    # Currencies that we want to track
    cryptos = [
        'BTC',
        'LTC',
        'XMR',
        'ZEC',
        'ETH',
        'BCH',
        'TRX',
        'DOGE'
    ]
    shuffle(cryptos)
    counter = 0
    cache = {}

    while True:
        # Reset counter and cache
        if counter >= 20:
            cache = {}
            counter = 0
            log(f'{datetime.today()} -- Resetting cache...')

        for crypto in cryptos:
            err = False

            # Create and image object to fit the display
            img = Image.new('P', (inkyphat.WIDTH, inkyphat.HEIGHT))
            draw = ImageDraw.Draw(img)

            # Get crypto price or use the cached price until we need to update the price again
            if crypto not in cache:
                try:
                    price = '${:,}'.format(cryptocompare.get_price(crypto, curr='USD')[crypto]['USD'])
                    cache[crypto] = price
                    log(f'{datetime.today()} -- Updating cache for {crypto} => {price} / counter => {counter}')
                except Exception as e:
                    log(f'{datetime.today()} -- Error... -- {e}')
                    err = True
            else:
                price = cache[crypto]
                log(f'{datetime.today()} -- Cached price for {crypto} => ({price}) / counter => {counter}')

            # Display error message if we cannot grab the price from cryptocompare
            if err is not True:
                message = f"1 {crypto} = {price}"
            else:
                message = "Error!"

            # draw image on the image object
            w, h = font.getsize(message)
            x = (inkyphat.WIDTH / 2) - (w / 2)
            y = (inkyphat.HEIGHT / 2) - (h / 2)
            draw.text((x, y), message, inkyphat.BLACK, font)

            # Set the image that we have drawn
            inkyphat.set_image(img)

            # Rotate the image
            inkyphat.h_flip = True
            inkyphat.v_flip = True

            # Display the final image
            inkyphat.show()

            # Increment counter per display refresh
            counter += 1

if __name__ == '__main__':
    main()