def __init__(self, a, b, phase, ratio):
        self._constraint = cp.cpGearJointNew(a._body, b._body, phase, ratio)
        self._ccontents = self._constraint.contents
        self._dsc = cp.cast(self._constraint, ct.POINTER(cp.cpGearJoint)).contents
        self._set_bodies(a,b)
Keeps the angular velocity ratio of a pair of bodies constant. 
dataset/ETHPy150Open estevaofon/angry-birds-python/pymunk-4.0.0/pymunk/constraint.py/GearJoint.__init__