Hello everyone.
I am a novice, im learing python when i programming quantopian , and I do not have the knowledge to do some things, so I ask for help.

I'm doing a system based on the coppock curve.

#Importamos las librerias necesarias  
import numpy as np  
import pandas as pd  
import talib

#iniciamos el sistema  
def initialize(context):  
    #Definimos todos los activos operables  
    context.gold = sid(26807) #GLD  
    context.bonds = sid(23921) # Bonds USA over TLT  
    context.bondscorp = sid(38952) # Bonds Corp Over  
    context.bondshigh = sid(41604) #Bonds Corp High Yield Short term  
    context.sp = sid(22739) #SPY  
   #context.btc = cooming soon

 # Funciones programadas, benchmark, comisiones splippage etc..  
    schedule_function(sp500, date_rules.every_day(), time_rules.market_open())  
    set_benchmark(symbol('VTI'))  
    set_commission(commission.PerShare(cost = 0.0050, min_trade_cost = 1.00))  
    set_slippage(slippage.VolumeShareSlippage(volume_limit = 0.025, price_impact = 0.1)) 

#Definimos el modulo sobre S&P 500

def sp500(context,data):  
    #Variables Locales de SP500 para su coppock  
    roc_1 = 14  
    roc_2 = 22  
    cop_wma = 10  
    bars = roc_1 + roc_2 + cop_wma + 1  
    #Procesamos el precio, y realizamos el coppock sobre el S&P 500  
    prices = data.history(context.sp, 'price', bars , '1d').dropna()  
    roc1 = talib.ROC(prices, roc_1)  
    roc2 = talib.ROC(prices, roc_2)  
    roc = roc1[-cop_wma:] + roc2[-cop_wma:]  
    Coppock = talib.WMA(roc, cop_wma)  
    if(Coppock[-1] > 1):  
        order_target_percent(context.sp, 1)  
        log.info("( Coppock S&P 500 : %.2f )" %Coppock[-1])  
        log.info(" [SPY] - Hay posiciones por Coppock Positivo ")  
    elif(Coppock[-1] < -1 ):  
        order_target_percent(context.sp, 0)  
        log.info("( Coppock S&P 500 : %.2f ) " %Coppock[-1])  
        log.info("[SPY] - No hay posiciones por Coppock Negativo")  

I would like to add the condition to if
if(Coppock[today] > Coppock[Yesterday): order_target...............

But I do not know how to do it, could someone give me a solution?

Thank you for all, and sorry for my poor english.