allreduce changed in 2.0.0?

We had been doing something like this:

if my_proc_has_unique_element():
    haveElement=1
else:
    haveElement=0
global_have_element, owning_proc = comm.allreduce(haveElement, op=MPI.MAXLOC)

now with mpi4py 2.0.0 I get TypeError: 'int' object is not iterable, and if I set haveElement to an array I don't get the right output. Is has the api changed?

Thanks, Chris

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