执行给定Python字典操作代码，判断输出结果是否为`None {'Name': '小杨', 'Age': 12, 'Sex': 'female'}`

dict1 = {"Name": "小杨", "Age": 13}
dict2 = {"Sex": "female", "Age": 12}
dict1.update(dict2)
a = dict1.setdefault("Height", 165)
print(a, dict1)