def __init__(self, lock):
    _BaseCondition.__init__(self, lock)
    self._waiters = set()
    self._single_condition = self._single_condition_class(self._lock)
In-place subtract. Updates self, with fields equal to self - PB.
dataset/ETHPy150Open ganeti/ganeti/lib/locking.py/PipeCondition.__init__--crossover with--dataset/ETHPy150Open daeilkim/refinery/refinery/bnpy/bnpy-dev/bnpy/suffstats/ParamBag.py/ParamBag.__isub__