def complement(a, b, presorted=False, buffersize=None, tempdir=None,
               cache=True, strict=False):

    return ComplementView(a, b, presorted=presorted, buffersize=buffersize,
                          tempdir=tempdir, cache=cache, strict=strict)
Return rows in `a` that are not in `b`. E.g.::
dataset/ETHPy150Open alimanfoo/petl/petl/transform/setops.py/complement