python – List comprehensions – 从字典中的字典中提取值

发布时间：2020-12-20 12:38:08 所属栏目：Python 来源：网络整理

导读：我想从字典词典中获取一个名单列表…… list = {'1':{'name':'fred'},'2':{'name':'john'}}# this code works a-okfor key,value in list.items(): names = [] for key,value in list.items(): names.append(value['name'])# and these consecutive comprehe

我想从字典词典中获取一个名单列表……

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]

但最后两个如何合并？

解决方法

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

您可以对列表推导使用以下修改

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

虽然在这种情况下,您不需要任何键,所以您可以这样做

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

（编辑：李大同）

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