python 字典 dict items values keys

dict.items()

 1 >>> d = dict(one=1,two=2)
 2 >>> it1 = d.items()
 3 >>> it1
 4 dict_items([('one', 1), ('two', 2)])
 5 >>> type(it1)
 6 <class 'dict_items'>
 7 >>> from collections import Iterable
 8 >>> from collections import Iterator
 9 >>> isinstance(it1, Iterable)
10 True
11 >>> isinstance(it1, Iterator)
12 False

dict.values()

 >>> d = dict(one=1, two=2)
 >>> values = d.values()
 >>> values
 dict_values([1, 2])
 >>> type(values)
 <class 'dict_values'>
 >>> from collections import Iterable
 >>> from collections import Iterator
 >>> isinstance(values, Iterable)
 True
 >>> isinstance(values, Iterator)
 False

dict.keys()

 >>> d = dict(one=1, two=2)
 >>> keys = d.keys()
 >>> keys
 dict_keys(['one', 'two'])
 >>> type(keys)
 <class 'dict_keys'>
 >>> from collections import Iterable
 >>> from collections import Iterator
 >>> isinstance(values, Iterable)
 True
 >>> isinstance(values, Iterator)
 False