如何在字典中定义Python字典？
字典对象是可变的。因此，一个字典对象可以用作键的值组件。因此，我们可以创建一个嵌套的字典对象，将另一个字典对象定义为与键关联的值。
>>>> students={"student1":{"name":"Raaj", "age":23, "subjects":["Phy", "Che", "maths"],"GPA":8.5},"student2":{"name":"Kiran", "age":21, "subjects":["Phy", "Che", "bio"],"GPA":8.25}}