在Python字典中排序键

Question

我有这样一个Json文件：

{
  "wasGeneratedBy": {
    "_:wGB3": {
      "prov:entity": "ivo://stsci/DSS-digitized-J.444",
      "prov:activity": "stcsiNum-1b"
    },
    "_:wGB1": {
      "prov:entity": "ivo://stsci/DSS-digitized-J.444-cutouts",
      "prov:activity": "cds_cutout444"
    },
    "_:wGB2": {
      "prov:entity": "ivo://stsci/DSS-digitized-I.444",
      "prov:activity": "stcsiNum-1a"
    }
  },
  "activity": {
    "stcsiNum-1a": {},

  },
  "used": {
    "_:u6": {
      "prov:entity": "ivo://stsci/DSS-Plate-R.444",
      "prov:activity": "stcsiNum-1c"
    },
    "_:u2": {
      "prov:entity": "ivo://stsci/DSS-Plate-I.444",
      "prov:activity": "stcsiNum-1a"
    },
    "_:u3": {
      "prov:entity": "ivo://stsci/DSS-digitized-J.444",
      "prov:activity": "cds_cutout444"

  },
  "entity": {
    "ivo://stsci/DSS-digitized-R.444": {},
    "ivo://stsci/DSS-digitized-J.444-cutouts": {},
    "ivo://stsci/DSS-Plate-R.444": {},
  }
}

但是我想把所有的键（“wasGeneratedBy”，“activiy”…）按如下特定顺序排序（“activity”，“entity”，“used”，“wasGeneratedBy”）

我宣布：

my_own_order = ['entity', 'used', 'activity','wasGeneratedBy']

我试过这个，但没用：

print sorted(fileName,order=my_own_order)

有什么建议吗？谢谢你

Answer 1

使用OrderedDict：

from collections import OrderedDict

print OrderedDict((k,mydict[k] for k in  my_own_order))