using multiple if statements in function

Here is my code:

ac = a + c
bd = b + d

indices = random.sample(range(len(ac)),len(ac))
ac = list(map(ac.__getitem__, indices))
bd = list(map(bd.__getitem__, indices))


with open('DD{}.csv'.format(fileName), 'w') as f:
    writer = csv.writer(f, delimiter=',')
    writer.writerow(['trial','target location',' source target',' source distractor','target','rt'])

    for i in range(len(ac)):

        loc = [1, 2]
        location = random.choice(loc)
        if location == 1:
            pos1 = [.05,.05]
            pos2 = [-.05, -.05]
        else:
            pos1 = [-.05, -.05]
            pos2 = [.05, .05]

        distractorstim = visual.ImageStim(win=win, pos=pos1, size=[0.5,0.5])
        distractorstim.autoDraw = True
        targetstim = visual.ImageStim(win=win, pos=pos2, size=[0.5,0.5])
        targetstim.autoDraw = True

        targetstim.image = ac[i]
        distractorstim.image = bd[i]
        win.flip()
        trialClock.reset()
        core.wait(.05)
        rt = trialClock.getTime()
        for el in ac:
            if el in a:
                target = 'congruent'
            else:
                target = 'incongruent'



    writer.writerow([i,location,ac[i],bd[i],target,rt])

So what this code does it it logs a bunch of information about a stimulus into an excel file. However, when I try to use the element function ('if el') to log data that is from list 'a', it will only log the last value repetitively. If I move the element function I can get it to log for each trial, but it will only log the last value for all everything else. Any idea how I might fix this? Any advice will be greatly appreciated. :)