Python中的自定义JSON sort_keys顺序

Python 2.6中有什么方法可以向JSON的sort_keys提供自定义键或cmp函数?

我有一个来自JSON的字典列表,如下所示:

[

{

"key": "numberpuzzles1",

"url": "number-puzzle-i.html",

"title": "Number Puzzle I",

"category": "nestedloops",

"points": "60",

"n": "087"

},

{

"key": "gettingindividualdigits",

"url": "getting-individual-digits.html",

"title": "Getting Individual Digits",

"category": "nestedloops",

"points": "80",

"n": "088"

}

]

…我已将其存储到list变量中assigndb。我希望能够加载JSON,对其进行修改,然后使用dumps(或其他方式)将其序列化回去,同时保持

顺序不变

到目前为止,我已经尝试过以下方法:

ordering = {'key': 0, 'url': 1, 'title': 2, 'category': 3,

'flags': 4, 'points': 5, 'n': 6}

def key_func(k):

return ordering[k]

# renumber assignments sequentially

for (i, a) in enumerate(assigndb):

a["n"] = "%03d" % (i+1)

s = json.dumps(assigndb, indent=2, sort_keys=True, key=key_func)

…但是当然dumps不像那样支持自定义键list.sort()。有风俗的东西JSONEncoder吗?我似乎无法继续前进。

回答:

这有点丑陋,但是如果tokland的解决方案对您不起作用:

data = [{'category': 'nestedloops', 'title': 'Number Puzzle I', 'url': 'number-puzzle-i.html', 'n': '087', 'points': '60', 'key': 'numberpuzzles1'}, {'category': 'nestedloops', 'title': 'Getting Individual Digits', 'url': 'getting-individual-digits.html', 'n': '088', 'points': '80', 'key': 'gettingindividualdigits'}]

ordering = {'key': 0, 'url': 1, 'title': 2, 'category': 3,

'flags': 4, 'points': 5, 'n': 6}

outlist = []

for d in data:

outlist.append([])

for k in sorted(d.keys(), key=lambda k: ordering[k]):

outlist[-1].append(json.dumps({k: d[k]}))

for i, l in enumerate(outlist):

outlist[i] = "{" + ",".join((s[1:-1] for s in outlist[i])) + "}"

s = "[" + ",".join(outlist) + "]"

以上是 Python中的自定义JSON sort_keys顺序 的全部内容, 来源链接: utcz.com/qa/406220.html

回到顶部