# Get distance between two Poses
def get_distance(self, a, b):
    first =  [a.position.x, a.position.y, a.position.z]
    second = [b.position.x, b.position.y, b.position.z]
    return distance.euclidean(first, second)

# distance.euclidean(a.position, b.position) causes the error "unsupported operand type(s) for -: 'Point' and 'Point'"
# distance.euclidean(list(a.position), list(b.position)" causes "'Point' object is not iterable"