• json 模块的基本使用学习


    内容大纲

        1: 为什么要学习json模块

          >1:因为网络之间的通信,还有不同语言之间的相互内容沟通,需要用到json 模式进行沟通

          >2:写入部分文件用json文件保存,

        2:json的序列化 

          json.dumps(iterable)

    dic ={'k1':'v1','k2':'v2','k3':'v3'}
    str_dic =json.dumps(dic)
    print(str_dic)
    >>>>>>
    {"k1": "v1", "k2": "v2", "k3": "v3"}

        3:将json 转化成字典

          json.loads(json模式的内容)

    dic ={'k1':'v1','k2':'v2','k3':'v3'}
    str_dic =json.dumps(dic)
    # print(str_dic)
    #将json 转成字典模式
    dic1 =json.loads(str_dic)
    print(dic1)
    >>>>>
    {'k1': 'v1', 'k2': 'v2', 'k3': 'v3'}

        4:自动把所有的' '  变成 " "

          json.dumps()      因为json 的模式就是 " "

    list_dic =[1,['a','b','c','d'],3,{'k1':'v1','k2':'v2','k3':'v3'}]
    str =json.dumps(list_dic)
    print(str)
    >>>>>
    [1, ["a", "b", "c", "d"], 3, {"k1": "v1", "k2": "v2", "k3": "v3"}]

        5:json 写入文件

          dump(iteaber,句柄) 

    dic ={'k1':'v1','k2':'v2','k3':'v3'}
    # json 写入文件
    with open('123.json','w',encoding='utf-8') as f:
        json.dump(dic,f)

        6:读取json文件

          json.load(句柄)

    with open('123.json','r',encoding='utf-8') as f1:
        ret =json.load(f1)
    print(ret)
    

        7:将多个json 写入json文件

    将多个json 文件写入文件
    dic1 = {'name': '春哥'}
    dic2 = {'name': '子伍'}
    dic3 = {'name': '王子'}
    with open('duo.json','w',encoding='utf-8') as f2:
        json.dump(dic1,f2)
        f2.write('
    ')
        json.dump(dic2,f2)
        f2.write('
    ')        #注意换行, 因为读的时候是for 循环句柄
        json.dump(dic3,f2)
        f2.write(json.dumps(dic1)+'
    ')
        f2.write(json.dumps(dic2)+'
    ')
        f2.write(json.dumps(dic3)+'
    ')
    with open('duo.json','r',encoding='utf-8') as f3:
         for line in f3:
             ret =json.loads(line)
             print(ret)
        ret =json.loads(f3.read())
    print(ret)

        8:  

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  • 原文地址:https://www.cnblogs.com/baili-luoyun/p/10246896.html
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