知识点1:python读取json文件，并把内容转化为字典

import json 
with open("/User/Downloads/trace.json",'r') as f:
    context=f.read()
    temp=json.loads(context)

注意事项：如果json文件如下格式：[{"PageJME": "1171", "GPCJME": "32234", "ServerJME": "2787", "ClientJME": "937"}, {"PageJME": "1171", "GPCJME": "32234", "ServerJME": "2787", "ClientJME": "937"}]
则可直接读取，如果是
A=[{"PageJME": "1171", "GPCJME": "32234", "ServerJME": "2787", "ClientJME": "937"}, {"PageJME": "1171", "GPCJME": "32234", "ServerJME": "2787", "ClientJME": "937"}]
则读取是要去除前面的字符 “A=”。
知识点2: python将字典存储为json格式

json.dump(temp, json_file2, ensure_ascii=False)

temp字典，json_file2文件名
知识点3:判断文件是否已经存在，若无，则新建；判断文件里是否有内容
if not os.path.exists(file_name):
os.system(r"touch %s" % file_name

if os.path.getsize(file_name):
file_name文件名

import datetime
today = datetime.date.today().strftime("%Y%m%d")

将日期读取出来，存储为字符串。

如下代码主要用于，读取一个字符串代码，将其转化为字典，提出中间重要的数据。
将这个数据存储为json，（这个要实现不断读取数据，存储为json格式，这个就需要不断读取数据，添加进去，再全部存储进去，直接存储进去会出现格式问题）。然后将这个文件中的数据，取平均值，再存入另一个文件中，这个也有可能不断存储，所以也要读取出来，添加新的数据，再存储起来。

import json
import datetime
import os

def str_to_dic():
#    data_jme_list=[]
    data_jme = {}
    with open("/Users/jiaojiaoyang/Downloads/trace.json", 'r') as f:
        context=f.read()[16:]
#       names=context[0:15]
#        print(type(f.read()))
        temp=json.loads(context)
#        print(temp)
        print(type(temp))
        data_jme['PageJME']=temp['JMTReport'][1]['PageJME']
        data_jme['GPCJME']=temp['JMTReport'][24]['GPCJME']
        data_jme['ServerJME'] = temp['JMTReport'][25]['ServerJME']
        data_jme['ClientJME'] = temp['JMTReport'][26]['ClientJME']
#        data_jme_list.append(data_jme)
        return data_jme

def save_jmt_into_file_with_data(dic,date):
    file_name="jme_"+date+".json"

    if not os.path.exists(file_name):
        os.system(r"touch %s" % file_name)

        #将文件里的文件读取出来，在数组中添加新的元素（字典）
    if os.path.getsize(file_name):

        json_file = open(file_name, 'r')
        context = json_file.read()
        temp = json.loads(context)
        json_file.close()
        temp.append(dic)
        json_file2=open(file_name,'w', encoding='utf-8')
        #temp=json.dumps(temp)
        json.dump(temp, json_file2, ensure_ascii=False)
        json_file.close()
        return file_name
    else:
        with open(file_name,'w') as json_file:
            data_json = []
            data_json.append(dic)
            #data_json = json.dumps(data_json)
            json.dump(data_json, json_file, ensure_ascii=False)
            print('success')
            json_file.close()
        return file_name

def updata_average_into_file(file_name,date):
    if not os.path.exists(file_name):
        os.system(r"touch %s" % file_name)
    if os.path.getsize(file_name):
        read_json=open(file_name,'r')
        context = read_json.read()
        temp = json.loads(context)
        #求取平均值
        average={}
        sum1=0
        for i in range(len(temp)):
            sum1+=int(temp[i]['PageJME'])
        average["PageJME"]=sum1/len(temp)
        sum2=0
        for i in range(len(temp)):
            sum2+=int(temp[i]['GPCJME'])
        average['GPCJME']=sum2/len(temp)
        sum3=0
        for i in range(len(temp)):
            sum3+=int(temp[i]['ServerJME'])
        average['ServerJME']=sum3/len(temp)
        sum4=0
        for i in range(len(temp)):
            sum4+=int(temp[i]['ClientJME'])
        average['ClientJME']=sum4/len(temp)
        read_json.close()
        #存储文件，将文件读取出来，再存进去
        file_name2 = "jme_averge.json"
        if not os.path.exists(file_name2):
            os.system(r"touch %s" % file_name2)
        if os.path.getsize(file_name2):
            json_file = open(file_name2, 'r')
            context = json_file.read()
            temp = json.loads(context)
            json_file.close()
            temp[date]=average
            json_file2=open(file_name2,'w', encoding='utf-8')
            #temp=json.dump(temp)
            json.dump(temp, json_file2, ensure_ascii=False)
            json_file.close()
            print('success')
        else:
            with open(file_name2,'w') as json_file:
                data_json = {}
                data_json[date]=average
                #data_json = json.dump(data_json)
                json.dump(data_json, json_file, ensure_ascii=False)
                print('success')
                json_file.close()
    else:
        print('无文件')

def save_jme_into_file(dic):
    today = datetime.date.today().strftime("%Y%m%d")
    file_name=save_jmt_into_file_with_data(dic, today)

    updata_average_into_file(file_name,today)

if __name__ == '__main__':
    today = datetime.date.today().strftime("%Y%m%d")

    data1=str_to_dic()
    data2=str_to_dic()
#    save_jmt_into_file_with_data(data1,today)
#    save_jmt_into_file_with_data(data2,today)
    save_jme_into_file(data1)
#    save_jme_into_file(data2)
#    read_json_to_dic()