提取從字典中的陣列

Question

嗨複製我有類型的字典的數組，看起來像這樣：

books = [ 
     {'Serial Number': '3333', 'size':'500', 'Book':'The Hobbit'}, 
     {'Serial Number': '2222', 'size':'100', 'Book':'Lord of the Rings'}, 
     {'Serial Number': '1111', 'size':'200', 'Book':'39 Steps'}, 
     {'Serial Number': '3333', 'size':'600', 'Book':'100 Dalmations'}, 
     {'Serial Number': '2222', 'size':'800', 'Book':'Woman in Black'}, 
     {'Serial Number': '6666', 'size':'1000', 'Book':'The Hunt for Red October'}, 
     ] 

我需要創建類型的字典單獨的數組，看起來像這樣基於重複的序列號：

duplicates = [ 
    '3333', [{'Book':'The Hobbit'}, {'Book':'100 Dalmations'}], 
    '2222', [{'Book':'Lord of the Rings'}, {'Book':'Woman in Black'}] 
] 

有沒有一種簡單的方法來使用內置函數來做到這一點，如果不是最好的方式來實現這一目標？

Answer 1

最Python的方式我能想到的：

from collections import defaultdict 
res = defaultdict(list) 

for d in books: 
    res[d.pop('Serial Number')].append(d) 

print({k: v for k, v in res.items() if len(v) > 1}) 

輸出：

{'2222': [{'Book': 'Lord of the Rings', 'size': '100'}, 
      {'Book': 'Woman in Black', 'size': '800'}], 
'3333': [{'Book': 'The Hobbit', 'size': '500'}, 
      {'Book': '100 Dalmations', 'size': '600'}]}