def get_knownns(self, prefix):
        global nsdict
        for ns,p in nsdict.items():
            if p == prefix: return ns
        return None
k lists; each list has N items
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/tablib-0.10.0/tablib/packages/odf/element.py/Element.get_knownns--crossover with--dataset/ETHPy150Open algorhythms/LeetCode/022 Merge k Sorted Lists.py/Solution.mergeKLists_TLE1