I have no class

[Seymore4Head]

What do I need to do to make a and b have different values?
import random
class RPS:
    throw=random.randrange(3)
a=RPS
b=RPS

print ("a ",a.throw)
print ("b ",b.throw)
if a.throw == b.throw:
    print("Tie")
elif (a.throw - b.throw)%3==1:    
    print("a Wins")
else:    
    print("b Wins")  

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I tried:  

class RPS:
    def __init__(self):
        self.throw=random.randrange(3)

AttributeError: type object 'RPS' has no attribute 'throw'