Python isinstance函数介绍

 
class objA:  
pass  
 
A = objA()  
B = 'a','v'  
C = 'a string'  
 
print isinstance(A, objA)  
print isinstance(B, tuple)  
print isinstance(C, basestring)  

True  
True  
True  

    isinstance(object, class-or-type-or-tuple) -> bool 
     
    Return whether an object is an instance of a class or of a subclass thereof. 
    With a type as second argument, return whether that is the object's type. 
    The form using a tuple, isinstance(x, (A, B, ...)), is a shortcut for 
    isinstance(x, A) or isinstance(x, B) or ... (etc.). 

>>>isinstance(lst, list) 
True 
 
>>>isinstance(lst, (int, str, list) ) 
True