我有一个python列表,里面有两个列表(每个房间一个 - 有2个房间),里面有字典。
我怎样才能改变这一点:
A = [
[{'rate': Decimal('669.42000'), 'room': 2L, 'name': u'10% OFF'},
{'rate': Decimal('669.42000'), 'room': 2L, 'name': u'10% OFF'},
{'rate': Decimal('632.23000'), 'room': 2L, 'name': u'15% OFF'},
{'rate': Decimal('632.23000'), 'room': 2L, 'name': u'15% OFF'}],
[{'rate': Decimal('855.36900'), 'room': 3L, 'name': u'10% OFF'},
{'rate': Decimal('855.36900'), 'room': 3L, 'name': u'10% OFF'}]
]
进入这个:
A = [
[{'rate': Decimal('669.42000'), 'room': 2L, 'name': u'10% OFF'},
{'rate': Decimal('669.42000'), 'room': 2L, 'name': u'10% OFF'}],
[{'rate': Decimal('632.23000'), 'room': 2L, 'name': u'15% OFF'},
{'rate': Decimal('632.23000'), 'room': 2L, 'name': u'15% OFF'}],
[{'rate': Decimal('855.36900'), 'room': 3L, 'name': u'10% OFF'},
{'rate': Decimal('855.36900'), 'room': 3L, 'name': u'10% OFF'}]
]
我需要在主列表中创建三个列表。每种促销类型一个。 感谢
答案 0 :(得分:1)
使用itertools.groupby
,您可以使用此嵌套理解:
>>> from itertools import groupby
>>> from pprint import pprint
>>> x = [list(g) for l in A for k, g in groupby(sorted(l))]
>>> pprint(x)
[[{'name': u'10% OFF', 'rate': Decimal('669.42000'), 'room': 2L},
{'name': u'10% OFF', 'rate': Decimal('669.42000'), 'room': 2L}],
[{'name': u'15% OFF', 'rate': Decimal('632.23000'), 'room': 2L},
{'name': u'15% OFF', 'rate': Decimal('632.23000'), 'room': 2L}],
[{'name': u'10% OFF', 'rate': Decimal('855.36900'), 'room': 3L},
{'name': u'10% OFF', 'rate': Decimal('855.36900'), 'room': 3L}]]
您可以为sorted
和groupby
(最好是相同的)提供关键功能,以便按特定属性进行分组:
from operator import itemgetter
fnc = itemgetter('rate') # if you want to group by rate
x = [list(g) for l in A for k, g in groupby(sorted(l, key=fnc), key=fnc)]