python-在字典字典中對元組列表進行排序

Question

我有一本字典，看起來像這樣：

{'AAA': {'A1': [(0, ('a', 'b')), (3, ('c', 'd')), (2, ('a', 'b'))],
         'B1': [(3, ('a', 'b')), (2, ('a', 'b')), (1, ('c', 'd'))]},
 'BBB': {'A1': [(4, ('a', 'b')), (2, ('c', 'd')), (1, ('a', 'b'))],
         'B1': [(3, ('c', 'd')), (2, ('a', 'b')), (1, ('a', 'b'))]}}

我想按元組列表中的第一個元素排序。

所需結果：

{'AAA': {'A1': [(0, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))],
         'B1': [(1, ('c', 'd')), (2, ('a', 'b')), (3, ('a', 'b'))]},
 'BBB': {'A1': [(1, ('a', 'b')), (2, ('c', 'd')), (4, ('a', 'b'))],
         'B1': [(1, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))]}}

Answer 1

您可以使用list.sort方法對列表進行排序

d = {'AAA': {'A1': [(0, ('a', 'b')), (3, ('c', 'd')), (2, ('a', 'b'))],
             'B1': [(3, ('a', 'b')), (2, ('a', 'b')), (1, ('c', 'd'))]},
     'BBB': {'A1': [(4, ('a', 'b')), (2, ('c', 'd')), (1, ('a', 'b'))],
             'B1': [(3, ('c', 'd')), (2, ('a', 'b')), (1, ('a', 'b'))]}}

for subd in d.values():
    for l in subd.values():
        l.sort()

from pprint import pprint
pprint(d)

{'AAA': {'A1': [(0, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))],
         'B1': [(1, ('c', 'd')), (2, ('a', 'b')), (3, ('a', 'b'))]},
 'BBB': {'A1': [(1, ('a', 'b')), (2, ('c', 'd')), (4, ('a', 'b'))],
         'B1': [(1, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))]}}

Answer 2

您可以使用嵌套字典理解：

d = {'AAA': {'A1': [(0, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))],
             'B1': [(1, ('c', 'd')), (2, ('a', 'b')), (3, ('c', 'd'))]},
     'BBB': {'A1': [(1, ('a', 'b')), (2, ('c', 'd')), (4, ('a', 'b'))],
             'B1': [(1, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))]}}
new_d = {a:{c:sorted(d, key=lambda x:x[0]) for c, d in b.items()} for a, b in d.items()}

輸出：

{'AAA': {'A1': [(0, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))],
         'B1': [(1, ('c', 'd')), (2, ('a', 'b')), (3, ('c', 'd'))]},
 'BBB': {'A1': [(1, ('a', 'b')), (2, ('c', 'd')), (4, ('a', 'b'))],
         'B1': [(1, ('a', 'b')), (2, ('a', 'b')), (3, ('c', 'd'))]}}