python可迭代对象怎么理解

通过调用Python内置的isinstance来判断是否是Iterable的实例

In [9]: isinstance([],Iterable)

Out[9]: True

In [10]: isinstance('',Iterable)

Out[10]: True

In [11]: isinstance({},Iterable)

Out[11]: True

In [12]: class MyList(object):

....:     def __init__(self):

....:         self.list = []

....:     def add(self,item):

....:         self.list.append(item)

....:        

In [13]: mylist = MyList()

In [14]: isinstance(mylist,Iterable)

Out[14]: False