Psychopy, new circle at each iter of loop

Question

just working on an experiment that works as a staircase. i have two circles, the player must RightKey or LeftKey to chose the brightest circle. So i did all of this inside the coder. Now I want to appear a new circle each time the player press a key. Here is a bit of code:

def getcolor():
    color = [360, 1, 1]
    color[0] = random.randint(0, 361)
    return color

def getfirst():
    rand=random.choices([True, False])
    if rand[0]:
        lcolor = getcolor()
        rcolor = lcolor[:]
        rcolor[2] = 0.8000
    else:
        rcolor = getcolor()
        lcolor = rcolor[:]
        lcolor[2] = 0.8000
    return lcolor, rcolor

for thisIncrement in staircase:  # will step through the staircase
    result = getfirst()
    lcolor, rcolor = result
    
    lcircle.draw()
    rcircle.draw()
    event.waitKeys()
    #core.wait(1)  # wait 500ms (use a loop of x frames for more accurate timing)

    # blank screen
    fixation.draw()
    win.flip(clearBuffer=True)

lcircle and rcicle are there on the first iter, but it doesnt reload at each.