Are the buying and selling functions of the BINANCE API correct?

Question

Python

This piece of code provides a function with commands to sell and buy cryptocurrency.
Do not look at the algorithm of actions) I am interested in whether the sell and buy commands are written correctly.
It seems that I wrote everything according to the dock, the first argument is a trading pair, the second is the number of crypt units for EUR.
It's scary to check the code, because it's not a test one) Knowledgeable people explain what's what? Maybe there is a good guide for these commands.

# Рынок
ASSET = 'DOGEEUR'
# Торгуемая валюта
CURRENCY = 'EUR'
# Торгуемая криптовалюта
CRYPTOCURRENCY = 'DOGE'

SIGNAL = 1

''' П о к у п к а '''
def order_market_buy(quantity):
  order = client.order_market_buy(symbol=ASSET, quantity=quantity)

''' П р о д а ж а '''
def order_market_sell(quantity):
  order = client.order_market_sell(symbol=ASSET, quantity=quantity)


def stocks(FIRST_PRICE): 

  # Функция обрезает число до n кол-во символов(Нужна чтобы при покупки и продажи не возникло ошибки)
  def toFixed(f: float, n=0):
    a, b = str(f).split('.')
    return '{}.{}{}'.format(a, b[:n], '0'*(n-len(b)))

  global SIGNAL

  if SIGNAL == 1:
    #ПОКУПКА КРИПТОВАЛЮТЫ
    order_market_buy("DOGEEUR", toFixed(float(balance(CURRENCY)['free']) / price(ASSET)))
    SIGNAL = 0

  elif SIGNAL == 0
    #ПРОДАЖА КРИПТОВАЛЮТЫ
    order_market_sell("DOGEEUR", toFixed(float(balance(CRYPTOCURRENCY)['free'])))
    SIGNAL = 1

Answer 1

So create a test account. There is also such an opportunity.