dict.values() doesnt return list as expected-CodePudding

Im trying to get values from my dictionary here

for elem in set(sample_txt):

       d = {elem:sample_txt.count(elem)}

print(d.values())

d.values() should return a list of values:

The methods dict. keys() and dict. values() return lists of the keys or values explicitly. There's also an items() which returns a list of (key, value) tuples, which is the most efficient way to examine all the key value data in the dictionary. from developers.google.com

So i should get something like this ['a','b', 'etc']. However in my example i get

type(d.values()) ---> <class 'dict_values'>

What's wrong

CodePudding user response：

The quote you posted is related to python2, where indeed it returned list. In python3 you need to cast it by yourself list(d.values())

CodePudding user response：

Given:

Python 3.10.2 (main, Feb  2 2022, 06:19:27) [Clang 13.0.0 (clang-1300.0.29.3)] on darwin

For Python 3, d.values() returns a dict_value object which is one of the dict view classes:

>>> txt='abcaaab'
>>> d={k:txt.count(k) for k in set(txt)}
>>> d
{'a': 4, 'c': 1, 'b': 2}
>>> d.values()
dict_values([4, 1, 2])

One of the neat things about dict views is the view is updated if the underlying dict changes:

>>> d
{'a': 4, 'c': 1, 'b': 2}
>>> v=d.values()
>>> v
dict_values([4, 1, 2])
>>> d['z']='live update!'
>>> v
dict_values([4, 1, 2, 'live update!'])

Depending on the version of Python, the representation may include the contents or may include only the class.