问题描述
假设我有以下数据结构:
SOME_LIST = [
{
'name': 'foo','alternatives': [
{
'name': 'Foo'
},{
'name': 'foo'
},{
'name': 'fu
}
]
},{
'name': 'bar','alternatives': [
{
'name': 'Bar'
},{
'name': 'bar'
},{
'name': 'ba'
}
]
}
]
['foo','Foo','fu',...,'ba']
我用各种列表推导式浏览了房子……但我不知道如何优雅地做到这一点。
我试过了:
[i['alternatives'] for i in SOME_LIST]
[*i['alternatives'] for i in SOME_LIST]
>>>SyntaxError: iterable unpacking cannot be used in comprehension
[alt['name'] for alt in [i['alternatives'] for i in SOME_LIST]]
>>>TypeError: list indices must be integers or slices,not str
解决方法
您可以使用嵌套列表理解:
result = [j['name'] for i in SOME_LIST for j in i['alternatives']]
输出:
['Foo','foo','fu','Bar','bar','ba']