Random sum - python

How do I make this actually give me an answer? I want it to output a sum, something like " 17-5=12 "

    import random
    no1 =(random.randint(1,20))
    function =(random.choice("+-*"))
    no2 =(random.randint(1,20))
    answer =no2,function,no1
    print(answer)