如何使用列表在 python 中添加新键和每个键的值？

Question

我有字典和清单。我想向字典中添加一个新键，以便每个键的值都等于数组元素之一。我在下面的示例中对此进行了更多解释

我的字典

[{'url': 'https://test.com/find/city-1', 'tit': 'title1', 'val': 1},
 {'url': 'https://test.com/find/city-2', 'tit': 'title1', 'val': 2},
 {'url': 'https://test.com/find/city-3', 'tit': 'title1', 'val': 3}
]

我的清单

['a','b','c']

我想要的：

[{'url': 'https://test.com/find/city-1', 'tit': 'title1', 'val': 1 , 'content' ='a'},
 {'url': 'https://test.com/find/city-2', 'tit': 'title1', 'val': 2,  'content' ='b'},
 {'url': 'https://test.com/find/city-3', 'tit': 'title1', 'val': 3,  'content' ='c'}
]

Answer 1

您可以使用 zip 将字典与内容字符串配对并为每个字典设置 'content' 键：

dicList = [{'url': 'https://test.com/find/city-1', 'tit': 'title1', 'val': 1},
 {'url': 'https://test.com/find/city-2', 'tit': 'title1', 'val': 2},
 {'url': 'https://test.com/find/city-3', 'tit': 'title1', 'val': 3}
]
contents = ['a','b','c']
for d,c in zip(dicList,contents):
    d['content'] = c

print(dicList)

[{'url': 'https://test.com/find/city-1', 'tit': 'title1', 'val': 1, 'content': 'a'}, 
 {'url': 'https://test.com/find/city-2', 'tit': 'title1', 'val': 2, 'content': 'b'}, 
 {'url': 'https://test.com/find/city-3', 'tit': 'title1', 'val': 3, 'content': 'c'}]

或者，如果您想要新列表中的结果，您可以使用列表理解来构建扩充词典：

dicList2 = [{**d, 'content':c} for d,c in zip(dicList,contents)]

Answer 2

压缩并分配：

for d, d['content'] in zip(dicts, contents):
    pass

演示 (Try it online!):

import pprint

dicts = [{'url': 'https://test.com/find/city-1', 'tit': 'title1', 'val': 1},
 {'url': 'https://test.com/find/city-2', 'tit': 'title1', 'val': 2},
 {'url': 'https://test.com/find/city-3', 'tit': 'title1', 'val': 3}
]
contents = ['a','b','c']

for d, d['content'] in zip(dicts, contents):
    pass

pprint.pp(dicts)

输出：

[{'url': 'https://test.com/find/city-1',
  'tit': 'title1',
  'val': 1,
  'content': 'a'},
 {'url': 'https://test.com/find/city-2',
  'tit': 'title1',
  'val': 2,
  'content': 'b'},
 {'url': 'https://test.com/find/city-3',
  'tit': 'title1',
  'val': 3,
  'content': 'c'}]

如何使用列表在 python 中添加新键和每个键的值？

How to add new keys and value of each of them in python with list?

python

dictionary

list

python-2.7

python-3.x