Python if statements not working

outcomeG = "0"
outcomeB = "0"

def roll():

    global outcomeG, outcomeB  

    outcomeG = random.randint(1, 6)
    outcomeB = random.randint(1, 5)

def greenDiceRoll():

    outcomeG = random.randint(1, 6)
    outcomeB = random.randint(1, 5)

    greenDiceOptions.destroy()

    global greenDiceRoll
    greenDiceRoll = tkinter.Tk()
    greenDiceRoll.title("Good Dice roll")

    lbloutcome = tkinter.Label(greenDiceRoll, text="Press roll")
    btnRollG = tkinter.Button(greenDiceRoll, text="Roll", command=roll)

    if outcomeG == "1":
        lbloutcome.config(text="Green 1")
        greenDiceRoll.update()
        f = open("Logs.txt", "a")
        ts = time.time()
        sttime = datetime.datetime.fromtimestamp(ts).strftime('%Y%m%d_%H:%M:%S - ')
        f.write(sttime + "Green 1")
        f.close()

    elif outcomeG == "2":
        lbloutcome.config(text="Green2")
        greenDiceRoll.update()
        f = open("Logs.txt", "a")
        ts = time.time()
        sttime = datetime.datetime.fromtimestamp(ts).strftime('%Y%m%d_%H:%M:%S - ')
        f.write(sttime + "Green 2")
        f.close()

        #rest of code

I am making a program that you can roll a red and a green dice. When you press the roll button the outcomeG and outcomeB do randomize a number. The problem is to do with the if statements, therefore the output doesn't go into the Logs.txt and the window isn't updated. Any help will be much appreciated.