def __init__(self):
        self.m_conId = 0
        self.m_delta = 0
        self.m_price = 0
Remove all vartree nodes.
dataset/ETHPy150Open CarterBain/Medici/ib/ext/UnderComp.py/UnderComp.__init__--crossover with--dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/depgraph.py/DependencyGraph._remove_vartrees