python - 在 Python 中过滤列表

Question

词典来源列表

[
    {'main_id': 0, '_id': ObjectId('111111111111111'), 'key1': 'val1'}, 
    {'main_id': 1, '_id': ObjectId('222222222222222'), 'key1': 'val2'}, 
    {'main_id': 1, '_id': ObjectId('333333333333333'), 'key1': 'val3'}, 
    {'main_id': 4, '_id': ObjectId('444444444444444'), 'key1': 'val4'},
    {'main_id': 2, '_id': ObjectId('555555555555555'), 'key1': 'val5'},
]

过滤后的字典列表

[
    {'main_id': 0, '_id': ObjectId('111111111111111'), 'key1': 'val1'}, 
    {'main_id': 1, '_id': ObjectId('222222222222222'), 'key1': 'val2'}, 
    {'main_id': 2, '_id': ObjectId('555555555555555'), 'key1': 'val3'},
]

我想获取新的词典列表:

[
    {'main_id': 1, '_id': ObjectId('333333333333333'), 'key1': 'val3'}, 
    {'main_id': 4, '_id': ObjectId('444444444444444'), 'key1': 'val4'},
]

换句话说，我想要一个新列表包含过滤列表中不存在的值。你的想法？

Answer 1

一类轮:

result = [s for s in original if s not in filtered]

<小时/>

或使用filter :

filter(lambda x: x not in filtered, original)