json解析与类别统计

json文件保存
代码1：

# encoding: utf-8
import json

data = {

        'roles':
            [
                {'role':'monster','type':'pig','life':50},
                {'role':'hero','type':'关羽','life':80}
            ]


        }
# dumps把数据类型转换成字符串 dump把数据类型转换成字符串并存储在文件中
# d = json.dumps(data)
# print d

# d = json.dump(data,'exam3.json')
# 这样的语法会出错
f = open('exam3.json','w')
d = j

代码2：

import json
import datetime
import getpass
import time
import os


class CocoJsonWriter:
    def __init__(
            self,
            foldername,
            filename,
            imgSize,
            databaseSrc='Unknown',
            localImgPath=None,
            shape_type=None):
        self.foldername = foldername
        self.filename = filename
        self.databaseSrc = databaseSrc
        self.imgSize = imgSize
        self.boxlist = []
        self.dict_list = []
        self.localImgPath = localImgPath
        self.shape_type = shape_type

    def addPolygon(self, name, instance_id):
        polygon = {}

        bpoint = []
        # for point in shape:
        #     b = list(point)
        #     bpoint.append(b)
        #     # bpoint[i] = list(point)
        #     # i = i + 1
        # polygon['polygon'] = bpoint
        polygon['label'] = name
        # polygon['point_num'] = str(len(shape))
        polygon['id'] = instance_id
        polygon['deleted'] = 0
        polygon['draw'] = True
        polygon['shape_type'] = self.shape_type
        polygon['verified'] = 0
        user = getpass.getuser()
        polygon['user'] = user
        date = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time()))
        polygon['date'] = date

        # self.boxlist.append(polygon)

        # dic=dict(label=cls_name,id=idx,date=nowTime,deleted=0,draw=True,user="None",verified=0,polygon=bpoint
        self.dict_list.append(polygon)

    def save(self, targetFile=None):
        #   output_namej = os.path.basename(im_name).strip('.jpg') + '_gtFine_polygons' + '.json'

        #  targetFile = os.path.join(json_dir, '{}'.format(output_namej))
        djson = {"filename": self.filename,
                 "imgHeight": self.imgSize[0],
                 "imgWidth": self.imgSize[1],
                 "depth": self.imgSize[2],
                 "objects": self.dict_list
                 }

        with open(targetFile, "w") as f:
            json.dump(djson, f, sort_keys=True, indent=4)
        print("%s saved." % targetFile)

JsonWriter = CocoJsonWriter(foldername = '111',filename = '222',imgSize=[0,1,2],databaseSrc='Unknown')
JsonWriter.addPolygon(name='333', instance_id=0)
JsonWriter.save('exam.json')

json文件解析

# -*- coding: utf-8 -*-
# 将 json格式的 class进行统一标签
# 可以直接批量读取json文件，并修改内容
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import json
import os
import scipy.misc
import sys
path = ""
files = os.listdir(path)
label_list = []
total_num=0
for json_file in files:

    if json_file.endswith('.json'):
        total_num += 1
        json_path= os.path.join(path, json_file)
        print(json_path)
        json_ann = json.load(open(json_path))

        objects = json_ann['objects']
        for item in objects:
            # 打印 label
            # print (item['label'])
            label_list.append(item['label'])
print(label_list)
category = set(label_list)  # myset是另外一个列表，里面的内容是mylist里面的无重复 项

# readme_path =
# with open(path+'readme.txt','w') as f:
with open(os.path.join(path, 'readme'), 'w') as f:
    '''
    保存信息
    '''
    f.write('总json文件数量 = %d'% total_num)
    f.write('\n类别数 = %s' % category)
    for label in category:
        print("the %s has found %d" % (label, label_list.count(label)))
        f.write("\nthe %s has found %d" % (label, label_list.count(label)))