改变了Zhihu类的父类,让Zhihu类继承Account #36
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在Zhihu、Account类中添加了构造函数(init)
原先Zhihu、Account继承自Models类,这样在程序在运行中会产生两个session对象
改变后不仅类结构易于理解,也不会产生两个session对象