Python 判断变量的数据类型

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于 2017-02-18 13:00:22 发布

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分类专栏： Python 文章标签： python 数据类型

本文链接：https://blog.youkuaiyun.com/mathcompfrac/article/details/55658813

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本文介绍如何在Python中使用type()和isinstance()进行变量类型的检查。通过实例演示了整型、字符串类型的判断，并讨论了NoneType类型判断的特殊情况。

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    import types  

    aaa = 0  
    print type(aaa)  
    if type(aaa) is types.IntType:  
        print "the type of aaa is int"  
    if isinstance(aaa,int):  
        print "the type of aaa is int"  

    bbb = 'hello'  
    print type(bbb)  
    if type(bbb) is types.StringType:  
        print "the type of bbb is string"  
    if isinstance(bbb,str):  
        print "the type of bbb is string"  

    #if the type is NoneType,the isinstance does not work  
    #we should judge the NoneType like below  
    #if row is None  
    #if type(row) is types.NoneType  

    #In my opinion,use the types to judge the type of a param is convinient, use the isinstance to judge whether a instance is a type of a class or not