def __init__(self, v1, v2):
        self.q = collections.deque([(len(v), iter(v)) for v in (v1, v2) if v])
INTEGRATION: creating an already existing directory without
dataset/ETHPy150Open kamyu104/LeetCode/Python/zigzag-iterator.py/ZigzagIterator.__init__--crossover with--dataset/ETHPy150Open jplana/python-etcd/src/etcd/tests/integration/test_simple.py/TestErrors.test_creating_already_existing_directory