Cannot get this code to work, simple Python else if statement

When I run the code below I keep getting a syntax error and it is highlighted where shown.

sf_population, sf_area = 864816, 231.89
rio_population, rio_area = 6453682, 486.5

sf_area = (int(sf_area))
rio_area = (int(rio_area))

def x= sf_population/sf_area
def y= rio_population/rio_area

if x<y:
    print"True"
if x>y:
    print"False"