Buy/Sell signal generator

Signal_Generator.py

buy = pd.DataFrame(index=closing_prices.index, columns=['Buy']) # an empty data-frame to store buy signals
sell = pd.DataFrame(index=closing_prices.index, columns=['Sell']) # an empty data-frame to store sell signals

for i in range(1, len(closing_prices)): # ignores first value of historical data as MACD will be equal to signal line there
    if i == 1:
        if MACD['EMA'].iloc[i] > signal_line['EMA'].iloc[i]:
            high = 'MACD'
        else:
            high = 'SIGNAL'
    elif MACD['EMA'].iloc[i] > signal_line['EMA'].iloc[i]:
        if high == 'SIGNAL': # MACD crossed signal - bottom to top BUY
            if MACD['EMA'].iloc[i] < 0: 
                buy.iloc[i] = closing_prices[i] # BUY
            high = 'MACD'
    elif MACD['EMA'].iloc[i] < signal_line['EMA'].iloc[i]:
        if high == 'MACD': # MACD crossed signal - top to bottom SELL
            if MACD['EMA'].iloc[i] > 0:
                sell.iloc[i] = closing_prices[i] # SELL
            high = 'SIGNAL'