Algorithm: Practical Set Reconciliation

《Practical Set Reconciliation》
Yaron Minsky Cornell University
Ari Trachtenberg Boston University

def set_reconcile(src_seq, dst_seq):
    "Return required operations to mutate src_seq into dst_seq"
    src_set= set(src_seq) # no-op if already of type set
    dst_set= set(dst_seq) # ditto

    for item in src_set - dst_set:
        yield 'delete', item

    for item in dst_set - src_set:
        yield 'create', item

for i in set_reconcile([1,2,3,4], [2,3,4,5]):
    print i

$ python 
('delete', 1)
('create', 5)

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