python list 自定义排序

数据格式

a = [{'name':'jk', 'score':4, 'first':1, 'second':2, 'third':2}, {'name':'zz', 'score':1, 'first':0, 'second':0, 'third': 1}, {'name': 'ns', 'score':4, 'first':1, 'second':0, 'third':4}]

处理要求

list

'score'

'score'

'first'

'first'

'second'

'second'

'third'

方法

>>> a.sort.__doc__
'L.sort(cmp=None, key=None, reverse=False) -- stable sort *IN PLACE*;\ncmp(x, y) -> -1, 0, 1'
>>> def cmp(a1, a2):
...     if a1['score'] != a2['score']:
...         return a1['score'] - a2['score']
...     elif a1['first'] != a2['first']:
...         return a1['first'] - a2['first']
...     elif a1['second'] != a2['second']:
...         return a1['second'] - a2['second']
...     else:
...         return a1['third'] - a2['third']
...
>>>
>>>
>>>
>>> a.sort(cmp)

结果

>>> a
[{'second': 0, 'score': 1, 'name': 'zz', 'third': 1, 'first': 0}, {'second': 0, 'score': 4, 'name': 'ns', 'third': 4, 'first': 1}, {'second': 2, 'score': 4, 'name': 'jk', 'third': 2, 'first': 1}]