![](/img/trans.png)
[英]Any pythonic way to form dictionaries from dictionary where few keys have list values?
[英]Select few Dictionary Keys from list of dictionaries while also adding new keys
我想從現有字典列表中選擇一些鍵,並通過查找另一張地圖來添加其他鍵。
主要清單如下
result=[{'key1':123,'key2':'prod','key3':'abc','key4':'cde'},{'key1':123,'key2':'prod','key3':'def','key4':'qrs'},{'key1':321,'key2':'sale','key3':'dssd','key4':'cfde'}]
新列表中需要的密鑰如下, key5
和key6
是需要添加的新密鑰
wantedkeys=['key1','key3','key5','key6']
字典用於添加新的鍵值
keyMap={(123, 'key5'): 'abc', (123, 'key6'): 'pqr'}
我可以選擇key1
和key3
來使用以下語法獲取輸出。
new_list = [{ key: record[key] for key in wantedkeys } for record in result if record['key2']=='prod']
但是在擴展它以添加其他鍵的同時,出現語法錯誤。
new_list = [{ key : keyMap[record['key1'],key] if key in ['key5','key6'] else key: record[key] for key in wantedkeys } for record in result if record['key2']=='Prod']
我知道可以通過遍歷列表來完成此操作,但是有沒有更多的pythonic方法可以實現更好的性能,因為我的列表將有幾百萬條記錄,因此任何幫助將不勝感激
得到了解決方案。 希望這會有所幫助
new_list = [dict({ key: record[key] for key in ['key1','key3']},key5=keyMap[record['key1'],'key5'],key6=keyMap[record['key1'],'key6']) for record in result if record['key2']=='prod']
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.