problem about slope in python script for bitcoin trading

[fisher_garry]

I have made it running:

import numpy as np

def initialize(state):
    state.counter = 0
    state.lastsignals = []

@schedule(interval="1d", symbol="BNBUSDT")
def handler(state, data):
    angle = 0
    signal = data.sma(2).last
    has_position = has_open_position(data.symbol, truncated=True)
    balance_base = float(query_balance_free(data.base))
    balance_quoted = float(query_balance_free(data.quoted))
    buy_amount = balance_quoted * 0.80 / data.close_last

    if state.counter < 2:
        state.counter += 1
        state.lastsignals.append(signal)
    else:
        
        state.lastsignals.append(signal)

    if state.counter == 2:
        plot("signal", state.lastsignals[-1], "BNBUSDT")

        # calculating the slope of last 4 candles
        slope = (state.lastsignals[-1] - state.lastsignals[-2]) / 0.125
        angle = np.rad2deg(np.arctan(slope))
        print("slope: ", slope)
        print("angle: ", angle)
        plot("angle of signal", angle, "BNBUSDT")

        if angle > 10: 
            print("-------")
            print("Checking for buying possibility of {}".format(data.symbol))
            print("buy amount:", buy_amount)
            print("buy price:", data.close_last)
            create_order(symbol=data.symbol, amount = buy_amount)

        elif angle < -5 and has_position:
            print("-------")
            print("Checking for selling possibility of {}".format(data.symbol))
            print("sell amount:", balance_base)
            print("sell price:",data.close_last)

            close_position(data.symbol)

I am trading in BNB on a one day interval. Feel free to test it out on trality.com. They are in beta so it is free. They also have trading testing for the past year or more for coins on binance. Cheers