问题描述
对Python而言,这是新的,并且有关于词典的问题。我有一个我以特定顺序宣布的字典,希望始终保持这样的顺序。键/值不能真正按照它们的价值保持顺序,我只是按照我宣布的顺序。所以如果我有字典:
d = {'ac':33,'gw':20,'ap':102,'za' 321,'bs':10}
如果我查看或迭代不是这样的顺序通过它,有什么办法确保Python将保持明确的命令,我声明了键/值?
使用Python 2.6
从集合导入OrderedDict
OrderedDict((word,True) b
包含
OrderedDict([('He',True),('will',True),('be',True),('the',True),('winner',True)])
如果值为 True
(或任何其他不可变对象)你也可以使用:
OrderedDict.fromkeys(words,真的)
new to Python and had a question about dictionaries. I have a dictionary that I declared in a particular order and want to keep it in that order all the time. The keys/values can't really be kept in order based on their value, I just want it in the order that I declared it.
So if I have the dictionary:
d = {'ac':33, 'gw':20, 'ap':102, 'za':321, 'bs':10}
It isn't in that order if I view it or iterate through it, is there any way to make sure Python will keep the explicit order that I declared the keys/values in?
Using Python 2.6
from collections import OrderedDict
OrderedDict((word, True) for word in words)
contains
OrderedDict([('He', True), ('will', True), ('be', True), ('the', True), ('winner', True)])
If the values are True
(or any other immutable object), you can also use:
OrderedDict.fromkeys(words, True)
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