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@author jackzhenguo
@desc 
@date 2019/3/4

50 返回对象哈希值  

返回对象的哈希值,值得注意的是自定义的实例都是可哈希的,list, dict, set等可变对象都是不可哈希的(unhashable)

In [1]: hash(xiaoming)
Out[1]: 6139638

In [2]: hash([1,2,3])
# TypeError: unhashable type: 'list'