python isinstance 判断各种类型的细节

缺乏、安全感 2024-03-30 09:39 52阅读 0赞

**1.基本语法**

isinstance(object, classinfo)

Return true if the object argument is an instance of the classinfo argument, or of a (direct, indirect or virtual) subclass thereof. Also return true if classinfo is a type object (new-style class) and object is an object of that type or of a (direct, indirect or virtual) subclass thereof. If object is not a class instance or an object of the given type, the function always returns false. If classinfo is neither a class object [nor][] a type object, it may be a tuple of class or type objects, or may recursively contain other such tuples (other sequence types are not accepted). If classinfo is not a class, type, or tuple of classes, types, and such tuples, a TypeError exception is raised.

classinfo 处可以是 a class, type, or tuple of classes and types，

如果是 tuple，则满足 tuple 中的任何一个即返回 True

**2.字符串的类型判断。**

字符串，分为 str 和 unicode，二者均继承自 basestring

> > > isinstance(u’3.0’, unicode)  
> > > True  
> > > isinstance(‘3.0’, str)  
> > > True  
> > > isinstance(u’3.0’, str)  
> > > False  
> > > isinstance(u’3.0’, str)  
> > > False  
> > > isinstance(u’3.0’, basestring)  
> > > True  
> > > isinstance(‘3.0’, basestring)  
> > > True

**3.数字的类型判断**

数字分为 int 和 float，暂未发现二者共同的有效父类。

可以用 (int, float) tuple 来判断是否为数字（int 或 float）

> > > isinstance(‘3’, (int, float))  
> > > False  
> > > isinstance(3.0, (int, float))  
> > > True  
> > > isinstance(3, (int, float))  
> > > True  
> > > isinstance(3.0, float)  
> > > True  
> > > isinstance(3.0, int)  
> > > False  
> > > isinstance(3, float)  
> > > False  
> > > isinstance(3, int)  
> > > True

转自：[https://www.weidianyuedu.com][https_www.weidianyuedu.com]

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