如何在Python中对字典列表进行排序

Question

我有一份Pyhton词典列表如下：

images = [{'uri': 'https://some-link.blob.core.windows.net.net/devthumbnails/1024x768/64/41/98/64419888297779407561461629073227065160696285270116603463558823470505654333611.jpg',
           'position': '0'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/33/44/41/33444169622672594337676840600346050570907940224888845885580705086781040628903.jpg',
           'position': '1'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/41/46/99/41469935475840270004889223861351938003980938652350786820222101550878440209095.jpg',
           'position': '2'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/58/75/58/5875586317181716679126235880198721021684963481995594779485630886902274081554.jpg',
           'position': '3'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/43/49/66/43496617617402984595952294447831932918405619473544645594784712841815014159696.jpg',
           'position': '4'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/58/02/34/58023409863921180862667204492888551278254010639571762445601939880620855964505.jpg',
           'position': '5'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/36/22/76/36227680451273880975070000838700274536225673420153023620631555589946521174102.jpg',
           'position': '6'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/25/08/19/25081934413799694457632686505539828478363116795387601261763375409872686844488.jpg',
           'position': '7'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/29/69/32/29693252042243727029651750357989431990778953906071901135228406135133977694240.jpg',
           'position': '8'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/32/08/12/32081296724310348807184322021859931042996444008194149989050172920699516702708.jpg',
           'position': '9'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/78/32/05/78320563911470703705431807857066302926786080992451285767704219765878587895294.jpg',
           'position': '10'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/45/68/68/45686886529184531303217514851187276286410962612950239302976824977433885355299.jpg',
           'position': '11'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/72/59/00/7259007439354083322229206921563369468125207106159648770203873465284114242890.jpg',
           'position': '12'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/84/48/54/84485459564719601932735074276164902175816462482914733108723651993560201088913.jpg',
           'position': '13'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/10/28/77/102877279417898628351098113431759126412045721643126079051218817213834246455153.jpg',
           'position': '14'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/39/83/38/39833822893039666936949954403817914899073341336875871633644019565696649530535.jpg',
           'position': '15'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/99/45/89/99458973667381587321791276054667596349042589326181154771316565893893148706844.jpg',
           'position': '16'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/82/61/29/82612936862475837022828306892947119148350841132548959316321620668433031577983.jpg',
           'position': '17'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/11/19/56/111956100385260490476900173411198572352351708852063055906233069090064975146790.jpg',
           'position': '18'}]

我想对它进行排序，并希望新列表如下：[first_three_elements, last_three_elements, the_rest]。你知道吗

我试过以下方法：

first_three = images[0:3]
the_rest = images[3:int(len(images) - 3)]
last_three = images[(int(len(images) - 3)):int(len(images))]
result = first_three + last_three + the_rest

但我有个错误：

unhashable type: 'slice'
unhashable type: 'slice'
unhashable type: 'slice'

你知道怎么解决吗？你知道吗

Answer 1

看起来你有一本字典。你知道吗

例如：

images = {"images" : [{'uri': 'https://some-link.blob.core.windows.net.net/devthumbnails/1024x768/64/41/98/64419888297779407561461629073227065160696285270116603463558823470505654333611.jpg',
           'position': '0'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/33/44/41/33444169622672594337676840600346050570907940224888845885580705086781040628903.jpg',
           'position': '1'},
          {'uri': 'https://some-link.blob.core.windows.net/devthumbnails/1024x768/41/46/99/41469935475840270004889223861351938003980938652350786820222101550878440209095.jpg',
           'position': '2'},
         .........

尝试：

first_three = images['images'][:3]
the_rest = images['images'][3:-3]
last_three = images['images'][-3]
result = first_three + last_three + the_rest
print(result)

---

在这里使用下面的代码片段会引发上述错误。你知道吗

first_three = images[0:3]

Traceback (most recent call last):
  File "....", line 75, in <module>
    first_three = images[0:3]
TypeError: unhashable type: 'slice'

Answer 2

images = images[:3] + images[-3:] + images[3:-3]

解释：将前三个元素[:3]添加到后三个元素[-3:]和其余元素[3:-3]。你知道吗

（假设列表中至少有6个元素。）

见Slicing, Dicing and Splicing