Question

例如

sample = [
  {'one':'test', 'two': 'hello'}, 
  {'one':'test', 'two': 'world'}, 
  {'one': 'test', 'two': 'python'}
]

我想改变每个＆＃39;一个＆＃39;来自＆＃39; test＆＃39;完成＆＃39;

Answer 1

使用for循环并重新分配键的值：

for i in sample:
    i['one'] = 'done'
sample
>>>[{'one': 'done', 'two': 'hello'}, {'one': 'done', 'two': 'world'}, {'one': 'done', 'two': 'python'}]

如果列表中的某些词条可能没有“一个”键，则将重新分配到try块中：

for i in sample:
    try:
        i['one'] = 'done'
    except KeyError:
        pass

Answer 2

在Python3中，您可以使用字典解包：

sample = [{'one': 'test', 'two': 'hello'}, {'one': 'test', 'two': 'world'}, {'one': 'test', 'two': 'python'}]
new_sample = [{**i, **{'one':'done'}} for i in sample]

输出：

[{'one': 'done', 'two': 'hello'}, {'one': 'done', 'two': 'world'}, {'one': 'done', 'two': 'python'}]

对于Python2，使用列表推导来创建新词典：

new_sample = [{a:'done' if a == 'one' else b for a, b in i.items()} for i in sample]

输出：

[{'one': 'done', 'two': 'hello'}, {'one': 'done', 'two': 'world'}, {'one': 'done', 'two': 'python'}]

循环遍历字典数组并更改一个键值

2 个答案: