I am very new to sage and I don't know any python.  I wrote the
following code but I get errors. Can some one help me please?

def urn(number):
     p = list(SetPartitions(number).list())
     l =  len(v)
     trivial = p[0]
     counter = 0
     rounds = 10
             for i in range(0,rounds):
             sp1 = p[randint(0,l)]:
             sp2 = p[randint(0,l)]:
             if sage.combinat.set_partition.sup(sp1, sp2) == trivial:
             counter = counter + 1
        probability = counter/rounds
   return probability

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