1. 基本語法

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

如果是 tuple，則滿足 tuple 中的任何一個即返回 True

2. 字符串的類型判斷。

字符串，分為 str 和 unicode，二者均繼承自 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. 數字的類型判斷

數字分為 int 和 float，暫未發現二者共同的有效父類。

可以用 (int, float) tuple 來判斷是否為數字(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