Nothing Happens when I run a python file, what should I do?

Hi I finished this in python. I ran file and nothing happened. This is a python trading bot linked to Alpaca trading using their API. When I attempt to run the code below nothing happens via terminal or alpaca.com

import alpaca_trade_api as tradeapi


class Martingale(object):
    def _int_(self):
        self.key = 'PKZNX2B2EBEJONDPTFG5'
        self.secret = 'F8r6Tsapnex1lb09kQTw8YYR6vydEMLuGPLOagHZ'
        self.alpaca_endpoint = 'https://paper-api.alpaca.markets'
        self.api = tradeapi.REST(self.key.self.secret, self.alpaca_endpoint)
        self.symbol = 'IVV'
        self.current_order = None
        self.last_price = 1

        try:
            self.position = int(self.api.get_position(self.symbol).qty)
        except:
            self.position = 0


def submit_order(self, target):
    if self.current_order is not None:
        self.api.cancel_order(self.current_order.id)

    delta = target - self.position
    if delta == 0:
        return
    print(f'Processing the order for {target} shares')

    if delta > 0:
        buy_quantity = delta
        if self.position < 0:
            buy_quantity = min(abs(self.position), buy_quantity)
        print(f'Buying {buy_quantity} shares')
        self.current_order = self.api.submit_order(
            self.symbol, buy_quantity, 'buy', 'limit', 'day', self.last_price)

    elif delta < 0:
        sell_quantity = abs(delta)
        if self.position > 0:
            sell_quantity = min(abs(self.position), sell_quantity)
        print(f'Selling {sell_quantity} shares')
        self.current_order = self.api.submit_order(
            self.symbol, sell_quantity, 'sell', 'limit', 'day', self.last_price)

        if __name__ == '__main__':
            t = Martingale()
            t.submit_order(3)