def __init__(self, action, o, container):
        self.action = action
        self.o = o
        self.container = container
Eliminate monomials with zero coefficient.
dataset/ETHPy150Open signalfx/maestro-ng/maestro/plays/tasks.py/Task.__init__--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/polys/rings.py/PolyElement.strip_zero