python isinstance 判断各种类型的小细节

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