if else return

[gujugolf]

I am new to Python. I am trying to have the following function change the values of certain lines depending on if the lines are populated or not. Please assist if you can. Thanks in advance.

def checkconsent (CF):
	original_consent = CF
	var = CF[0:2]
	var1 = "RY"
	if CF == "RY" or "RN" or "NY" or "NN":
		return var
	else:
	    return var1

CONSENT = aps.checkconsent(line[1491:1493])
CONSENT1 = aps.checkconsent(line[1493:1495])
CONSENT2 = aps.checkconsent(line[1495:1497])
CONSENT3 = aps.checkconsent(line[1497:1499])
CONSENT4 = aps.checkconsent(line[1499:1501])
CONSENT5 = aps.checkconsent(line[1501:1503])