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
键 的 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) + "]"
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