Python Json dump 排序

{ "Frame_1": { "Gyro": { "Y": 0.0431044436991215, "X": -0.128382220864296, "Z": 0.00210362509824336 }, "Speed": 35.288933944702144 }, "Frame_0": { "Gyro": { "Y": 0.00257105240598321, "X": 0.00864287838339806, "Z": 0.00034347633481957 }, "Speed": 36.00000686645497 }, "Frame_3": { "Gyro": { "Y": 0.00671307928860188, "X": -0.0335018187761307, "Z": 0.0023413912858814 }, "Speed": 35.07128105163574 }, "Frame_2": { "Gyro": { "Y": 0.0185721646994352, "X": -0.064938560128212, "Z": 0.00250079506076872 }, "Speed": 35.07538719177245 }, "Frame_5": { "Gyro": { "Y": 0.000189732760190964, "X": 0.0555581152439117, "Z": -0.000144915247801691 }, "Speed": 35.057118988037125 }, "Frame_4": { "Gyro": { "Y": 0.000926836859434843, "X": 0.0221181996166706, "Z": 0.00129420927260071 }, "Speed": 35.064998245239266 }, "Frame_7": { "Gyro": { "Y": 0.0112417610362172, "X": 0.0702161639928818, "Z": -0.000678822922054678 }, "Speed": 35.05320854187012 }, "Frame_6": { "Gyro": { "Y": 0.00591291394084692, "X": 0.0615334995090961, "Z": -0.00052359706023708 }, "Speed": 35.05526161193848 }, "Frame_9": { "Gyro": { "Y": -0.00361005892045796, "X": 0.0625056177377701, "Z": 0.000491097511257976 }, "Speed": 35.056971359252934 }, "Frame_8": { "Gyro": { "Y": 0.00178188597783446, "X": 0.0678772628307343, "Z": 2.46742856688797e-05 }, "Speed": 35.05575599670409 }, "Frame_17": { "Gyro": { "Y": -0.00567389279603958, "X": -0.0360512584447861, "Z": 0.00172739056870341 }, "Speed": 35.07922210693359 }, "Frame_16": { "Gyro": { "Y": -0.00599162839353085, "X": -0.0354457423090935, "Z": 0.00122400268446654 }, "Speed": 35.073983001708974 }, "Frame_11": { "Gyro": { "Y": -0.015567815862596, "X": 0.0223790351301432, "Z": 0.000504573457874358 }, "Speed": 35.06145858764647 }, "Frame_10": { "Gyro": { "Y": -0.00943058542907238, "X": 0.0460546128451824, "Z": 0.00108171324245632 }, "Speed": 35.05959777832031 }, "Frame_13": { "Gyro": { "Y": -0.00979409366846085, "X": -0.011681804433465, "Z": -0.00033324770629406 }, "Speed": 35.06372795104981 }, "Frame_12": { "Gyro": { "Y": -0.0158915147185326, "X": 0.00997055135667324, "Z": 0.000176352594280615 }, "Speed": 35.06202163696288 }, "Frame_15": { "Gyro": { "Y": -0.00898778159171343, "X": -0.0297230798751116, "Z": 0.000266117189312354 }, "Speed": 35.069303512573235 }, "Frame_14": { "Gyro": { "Y": -0.00862599350512028, "X": -0.0252590328454971, "Z": -0.00013398913142737 }, "Speed": 35.06749076843262 }, "Frame_18": { "Gyro": { "Y": -0.00475228251889348, "X": -0.0331445522606373, "Z": 0.00177123316098005 }, "Speed": 35.08075332641603 } }

import json data = {} frame_counter = 0 with open("C:\\Users\\udis\\Desktop\\Filename.json") as json_data: newJson = json.load(json_data) logs = newJson['Logs'] counter = -1 for item in logs: if item['Type'] == 'Gyro': counter += 1 frame = "Frame_%d" % counter data[frame] = {'Gyro':{ 'Y':item['Gyroscope']['pitch_rate'], 'X': item['Gyroscope']['roll_rate'], 'Z': item['Gyroscope']['yaw_rate'] }, 'Speed':'Null' } elif item['Type'] == 'CarTelemetries': data[frame]['Speed'] = item['Speed'] * 3.6 filePathName = "C:\\Users\\udis\\Desktop\\car_data.json" with open(filePathName, 'w') as f: json.dump(data, f, indent=4)

1条回答

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1楼 · 发布于 2024-06-09 07:46:34

Json是无序的，所以当你读回它时，你必须自己排序：

from pprint import pprint
from collections import OrderedDict
import re

d = {
    "Frame_1": {
        "Gyro": {
            "Y": 0.0431044436991215,
            "X": -0.128382220864296,
            "Z": 0.00210362509824336
        },
        "Speed": 35.288933944702144
    },
    # ... etc
}

def sort_my_dict(d):
   l = sorted([(k, v) for k, v in d.items()], key=lambda v: int(re.findall('\d+', v[0])[0]  ))
   return OrderedDict(l)

pprint(sort_my_dict(d))

输出：

OrderedDict([('Frame_0',
              {'Gyro': {'X': 0.00864287838339806,
                        'Y': 0.00257105240598321,
                        'Z': 0.00034347633481957},
               'Speed': 36.00000686645497}),
             ('Frame_1',
              {'Gyro': {'X': -0.128382220864296,
                        'Y': 0.0431044436991215,
                        'Z': 0.00210362509824336},
               'Speed': 35.288933944702144}),
             ('Frame_2',
              {'Gyro': {'X': -0.064938560128212,
                        'Y': 0.0185721646994352,
                        'Z': 0.00250079506076872},
               'Speed': 35.07538719177245}),
#etc...

编辑：

您可以像正常的dict一样访问OrderedDict：

sorted_dict = sort_my_dict(d)    
pprint(sorted_dict["Frame_18"])

输出：

{'Gyro': {'X': -0.0331445522606373,
          'Y': -0.00475228251889348,
          'Z': 0.00177123316098005},
 'Speed': 35.08075332641603}

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