@property
    def ph_sz(self):
        ph = self.ph
        if ph is None:
            raise ValueError("not a placeholder shape")
        return ph.sz
Test empty() method.
dataset/ETHPy150Open scanny/python-pptx/pptx/oxml/shapes/shared.py/BaseShapeElement.ph_sz--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/appengine-mapreduce/python/test/mapreduce/json_util_test.py/JsonPropertyTest.testEmpty