python - 列表理解——从字典中的字典中提取值

Question

我正在尝试从字典中获取姓名列表...

list = {'1':{'name':'fred'}, '2':{'name':'john'}}

# this code works a-ok
for key, value in list.items():
    names = []
    for key, value in list.items():
        names.append(value['name'])



# and these consecutive comprehensions also work...
keys = [value for key, value in list.items()]


names = [each['name'] for each in keys]

但是最后两个怎么结合呢？

Answer 1

>>> d = {'1':{'name':'fred'}, '2':{'name':'john'}}

您可以对列表理解使用以下修改

>>> [value.get('name') for key, value in d.items()]
['john', 'fred']

尽管在这种情况下，您不需要key 做任何事情，所以您可以做

>>> [value.get('name') for value in d.values()]
['john', 'fred']