Cabinato trading x Molteni - modalità spot

import time
import ccxt
import RPi.GPIO as GPIO


exchange = ccxt.binance({
        'apiKey': '',
        'secret': '',
        'enableRateLimit': True,
})

def inizializza():
    exchange.load_markets()
    GPIO.setwarnings(False)
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(31, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(33, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(35, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(37, GPIO.IN, pull_up_down=GPIO.PUD_UP)


def cento_dollari_di(cosa):
    return str(round(10/float(exchange.fetchTicker(cosa+'/USDT')['last']),6))


def compra(cosa,quanto):
    print("Starei comprando " + cosa + '/USDT')
    try:
        exchange.createMarketBuyOrder(cosa+'/USDT', quanto)
    except:
        print("errore")

def vendi(cosa,quanto):
    print("Starei vendendo " + cosa + '/USDT')
    try:
        exchange.createMarketSellOrder(cosa+'/USDT', quanto)



inizializza()

while True:
    if GPIO.input(31) == GPIO.LOW:
        compra('BTC', cento_dollari_di('BTC'))
        time.sleep(0.1)
        while GPIO.input(31) == GPIO.LOW:
            time.sleep(0.1)
        time.sleep(0.5)

    if GPIO.input(33) == GPIO.LOW:
        compra('ETH', cento_dollari_di('ETH'))
        time.sleep(0.1)
        while GPIO.input(33) == GPIO.LOW:
            time.sleep(0.1)
        time.sleep(0.5)

    if GPIO.input(35) == GPIO.LOW:
        vendi('BTC', cento_dollari_di('BTC'))
        time.sleep(0.1)
        while GPIO.input(35) == GPIO.LOW:
            time.sleep(0.1)
        time.sleep(0.5)

    if GPIO.input(37) == GPIO.LOW:
        vendi('ETH', cento_dollari_di('ETH'))
        time.sleep(0.1)
        while GPIO.input(37) == GPIO.LOW:
            time.sleep(0.1)
    time.sleep(0.5)