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python脱产4期内容整理NO.21

时间:2018-10-18 21:35:02      阅读:145      评论:0      收藏:0      [点我收藏+]

今日内容主要有:

一、pickle模块
二、shelve模块
三、json模块
四、json练习
五、xml模块
六、xml模块
七、configparser模块

 

一、pickle模块

#pickle是一个用来序列化的模块
#序列化是什么?
#指的是将内存中的数据结构转换为一种中间格式 并存储到硬盘上

#反序列化是什么?
#将硬盘上存储的中间格式数据再还原为内存中的数据结构

#为什么要序列化?
#就是为了将数据持久存储
#之前学过的文件也能持久化存储 但是操作起来非常麻烦
#总结:pickle模块主要功能
#    dump
#   load
#    dumps 序列化
#    loads  序列化
#   不带s是帮你封装了read和writh


import pickle


#用户注册得到的数据
name = "高根"
password = "123"
height = "1.5"
hobby = ["","",""]

with open("userdb.txt","wt",encoding="utf-8") as f:
    text="|".join([name,password,str(height)])
    f.write(text)

#序列化的过程
user={"name":name,"password":password,"height":height,"hobby":hobby}


#支持python中所有格式
with open("userdb.pkl","wb",)as f:
    userbytes=pickle.dumps(user)
    f.write(userbytes)

#反序列化过程
with open("userdb.pkl","rb")as f:
    userbytes=f.read()
    user=pickle.loads(userbytes)
    print(user)
    print(type(user))

#dump使用 直接序列化到文件

with open("userdb.pkl","wb")as f:
    pickle.dump(user,f)


#load从文件反序列化
with open("userdb.pkl","rb")as f:
    user=pickle.load(f)
    print(user)

#打包成函数(序列化)
def myload(filename):
    with open(filename,"rb") as f:
        return pickle.load(f)

 

二、shelve模块

#内存->内置->sys.path
import shelve

"""
    shelve模块也用于序列化
    它与pickle不同之处在于 不需要关心文件模式什么的 直接把他当成一个字典来看待
    它可用于进行修改
"""
user={"name":"高根"}
s = shelve.open("userdb.shv")
s["user"]=user
s.close()


s=shelve.open("userdb.shv",writeback=True)
print(s["user"])
s["user"]["age"] = 20
s.close()

 

三、json模块

"""
    pickle和shelve 序列化后的到的数据只能python才能解析
    通常企业开发不可能做一个当即程序 都需要联网进行计算机间交互
    我么必须要保证这个数据 能够跨平台使用

    JSON是什么? Java script object notation 就是对象表示法
    var obj = {“name”:“egon”}
    
    
    对于我们开发而言,json就是一种通用的数据格式 任何语言都能解析
    js中的数据类型  python数据类型的对应关系
    {}              字典
    []              list
    string“”        str
    int/float       int/float
    true/false      True/False
    null            None
    
    
    json的语法规范
    最外层通常是一个字典或列表
    {} or []
    只要你想写个json格式的数据最外层直接写{}
    
    字符串必须是双引号,可以在面套任意多的层次
    
    json模块的核心功能
    dump
    dumps
    load
    loads
    不带s 封装了write和read功能
    
    
    
    
"""

import json

# 反序列化
with open("a.json","rt",encoding="utf-8")as f:
    res=json.loads(f.read())
    print(type(res))

with open("a.json",encoding="utf-8") as f:
    print(json.load(f))

# 直接解析字符串的json为python对象

jsontext = """{
    "user": [{
            "name": "egon",
            "age": "18"
        },
        {
            "name": "egon",
            "age": "18"
        }
    ]
}"""

res=json.loads(jsontext)
print(res)


mydic={
    "user": [{
            "name": "egon",
            "age": "18"
        },
        {
            "name": "egon",
            "age": "18"
        }
    ]
}

with open("b.json", "wt",encoding="utf-8") as f:
    f.write(json.dumps(mydic))

with open("b.json", "wt",encoding="utf-8") as f:
    json.dump(mydic, f)

dic = {"a":"理查德姑妈","b":"杰克船长","c":"神秘客人"}
with open("c.json","wt",encoding="utf-8") as f:
    f.write(json.dumps(dic))

with open("c.json","rt",encoding="utf-8")as f:
    d = json.loads(f.read())
    print(d)

 

四、json练习

 

#将下面内容存储到(news.json)文件

技术分享图片
"reason":"成功的返回",
    "result":{
        "stat":"1",
        "data":[
            {
                "uniquekey":"35efd2ba169d7f965669d44eb7cb8a2e",
                "title":"原油技术分析:API意外减少油价暂获支撑 晚间EIA将决定油价命运",
                "date":"2018-10-17 10:15",
                "category":"头条",
                "author_name":"FX168财经",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017101548328.html",
                "thumbnail_pic_s":"http:\/\/05imgmini.eastday.com\/mobile\/20181017\/20181017101548_ce78d3f30d852abd47767db8f203f2fc_1_mwpm_03200403.jpg"
            },
            {
                "uniquekey":"1618e0662b838a153513c5b2a052e25f",
                "title":"战胜荷兰后,中国女排已提前完成目标,郎平27个字霸气宣战意大利",
                "date":"2018-10-17 10:08",
                "category":"头条",
                "author_name":"蓝天侃球",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100831808.html",
                "thumbnail_pic_s":"http:\/\/06imgmini.eastday.com\/mobile\/20181017\/20181017100831_0b2d9fb72339fc3cc95650ff8bfa133b_1_mwpm_03200403.jpg",
                "thumbnail_pic_s02":"http:\/\/06imgmini.eastday.com\/mobile\/20181017\/20181017100831_0b2d9fb72339fc3cc95650ff8bfa133b_2_mwpm_03200403.jpg",
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            },
            {
                "uniquekey":"64a242ea9d12444cc36b2343810f71d9",
                "title":"华为何刚:华为Mate20系列国内版比海外版配置更高!",
                "date":"2018-10-17 10:03",
                "category":"头条",
                "author_name":"锋科技",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100355012.html",
                "thumbnail_pic_s":"http:\/\/07imgmini.eastday.com\/mobile\/20181017\/20181017100355_b993a230dffab4a79c14faf62c4b69b3_1_mwpm_03200403.jpg",
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            },
            {
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                "title":"盘点NBA4大“绝世好男人”,威少为妻不逛夜店,库里初中定情",
                "date":"2018-10-17 10:02",
                "category":"头条",
                "author_name":"体坛之王",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100227516.html",
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            },
            {
                "uniquekey":"c69cd1bc7ce70e3f100fa0ffa0878776",
                "title":"一个番茄5味药!男人强身,女人养颜,老人抗癌,错过真亏",
                "date":"2018-10-17 10:01",
                "category":"头条",
                "author_name":"39健康网",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100120544.html",
                "thumbnail_pic_s":"http:\/\/02imgmini.eastday.com\/mobile\/20181017\/20181017_cdc69488259c28d2b5c222d176f22cbd_cover_mwpm_03200403.jpg",
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            },
            {
                "uniquekey":"6ebf32c2a30704d0503910114ba396af",
                "title":"创业板估值位于历史最低 但业绩增速放缓分析师继续唱空",
                "date":"2018-10-17 10:00",
                "category":"头条",
                "author_name":"财联社",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100055547.html",
                "thumbnail_pic_s":"http:\/\/04imgmini.eastday.com\/mobile\/20181017\/20181017100055_82eff7d2425f422b3cc0ad37d1982255_3_mwpm_03200403.jpg",
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            },
            {
                "uniquekey":"a7e459aebf8aa6d74e7ddc4b156baf36",
                "title":"2018赛季奖励一览 S8赛季胜利女神皮肤奖励介绍",
                "date":"2018-10-17 10:00",
                "category":"头条",
                "author_name":"斗玩网",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100045828.html",
                "thumbnail_pic_s":"http:\/\/03imgmini.eastday.com\/mobile\/20181017\/20181017100045_99ac69a133f6b87f242b3651cb747b83_6_mwpm_03200403.jpg",
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            },
            {
                "uniquekey":"c4d04bf47c5a45bcb7f0313b60de84d8",
                "title":"国产全新大众速腾比朗逸大一圈!这回你满意了吧!",
                "date":"2018-10-17 10:00",
                "category":"头条",
                "author_name":"快车报",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100014570.html",
                "thumbnail_pic_s":"http:\/\/03imgmini.eastday.com\/mobile\/20181017\/20181017100014_316d207ba4061e7d5651db8259e88319_8_mwpm_03200403.jpg",
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            },
            {
                "uniquekey":"48721b05ac0e8cc8a1419f4dde398984",
                "title":"终于看到NPC团综的希望,九个小哥哥集体飞北京,疑似团综开拍",
                "date":"2018-10-17 10:00",
                "category":"头条",
                "author_name":"用微笑离开后的坚强",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017100006065.html",
                "thumbnail_pic_s":"http:\/\/03imgmini.eastday.com\/mobile\/20181017\/20181017100006_29e6023f4ca7a46c5eb7f470ac2c9eb3_3_mwpm_03200403.jpg",
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            },
            {
                "uniquekey":"2bdc6124ecee5a3789c994dfec2ced06",
                "title":"RNG小组第一EDG小组第二 这让网友产生一个可怕的想法!",
                "date":"2018-10-17 09:58",
                "category":"头条",
                "author_name":"淘游助手",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017095804681.html",
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            {
                "uniquekey":"21b311386ac530f1a2dffbfe1f3f6f73",
                "title":"电动自行车行业发展现状分析 市场或将迎来洗牌",
                "date":"2018-10-17 09:57",
                "category":"头条",
                "author_name":"前瞻产业研究院",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017095726864.html",
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            },
            {
                "uniquekey":"b34556aeb06e8f2bef654bee4e428137",
                "title":"半决赛中国VS意大利,意大利输球挑中国队,朗平:他们会后悔",
                "date":"2018-10-17 09:56",
                "category":"头条",
                "author_name":"学尔纳",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017095644664.html",
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            },
            {
                "uniquekey":"fee031516e7f7f78c48a6644a7cb36d2",
                "title":"郎平再造霸气金句!央视记者无脑提问再被一句话高智商化解",
                "date":"2018-10-17 09:55",
                "category":"头条",
                "author_name":"peace说球",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017095533594.html",
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            },
            {
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                "title":"郭靖为国镇守襄阳,那俏黄蓉私生活是如何过的小说已给出答案!",
                "date":"2018-10-17 09:53",
                "category":"头条",
                "author_name":"北岛的旧梦",
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                "date":"2018-10-17 09:53",
                "category":"头条",
                "author_name":"阿木细说",
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                "date":"2018-10-17 09:52",
                "category":"头条",
                "author_name":"足球部落国际版",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017095221673.html",
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            },
            {
                "uniquekey":"a4b3e2885c14f59ac99c1ffa7c8af470",
                "title":"大型魔术秀:消失的身体!求求你们放过近视眼吧……哈哈",
                "date":"2018-10-17 09:49",
                "category":"头条",
                "author_name":"HOT男人",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017094950231.html",
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            },
            {
                "uniquekey":"8f4d38978ccf590a6b99aabf195f2652",
                "title":"夜猫子的你应该知道的“小秘密”",
                "date":"2018-10-17 09:48",
                "category":"头条",
                "author_name":"广州建国医院精神科",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017094842986.html",
                "thumbnail_pic_s":"http:\/\/01imgmini.eastday.com\/mobile\/20181017\/20181017_0a964b132e85c005a82ac71c2ab645af_mwpm_03200403.jpg"
            },
            {
                "uniquekey":"ffc9347ca9a76a60ca4e042a66cd6e0a",
                "title":"不卸妆就分手?19岁男生为爱卸掉自己挚爱的妆容,素颜让人震撼",
                "date":"2018-10-17 09:47",
                "category":"头条",
                "author_name":"派大星的小可爱A",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017094719931.html",
                "thumbnail_pic_s":"http:\/\/04imgmini.eastday.com\/mobile\/20181017\/20181017094719_3fd44b93a4fce69dfcc2178d41bebe4f_3_mwpm_03200403.jpg",
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                "date":"2018-10-17 09:45",
                "category":"头条",
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                "date":"2018-10-17 09:44",
                "category":"头条",
                "author_name":"中国新闻网四川新闻",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017094450133.html",
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                "title":"浪琴的30款时尚名表,最爱哪一款?",
                "date":"2018-10-17 09:44",
                "category":"头条",
                "author_name":"灌云醉意浓服装",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017094431457.html",
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                "date":"2018-10-17 09:40",
                "category":"头条",
                "author_name":"家居小吴",
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                "date":"2018-10-17 09:37",
                "category":"头条",
                "author_name":"快乐分享",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017093735819.html",
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                "title":"封面人物|陈丽媛与马拉松的故事",
                "date":"2018-10-17 09:36",
                "category":"头条",
                "author_name":"创客儿",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017093650361.html",
                "thumbnail_pic_s":"http:\/\/01imgmini.eastday.com\/mobile\/20181017\/20181017_91bba059bc1f13045d4ee7272b2f89f6_cover_mwpm_03200403.jpg",
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                "title":"求生欲如此强的《奇葩说》第五季,如今连李诞都救不活了?",
                "date":"2018-10-17 09:35",
                "category":"头条",
                "author_name":"娱乐大咖秀",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017093523888.html",
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                "date":"2018-10-17 09:33",
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                "author_name":"杀生丸",
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                "category":"头条",
                "author_name":"夏木渊",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017093050040.html",
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                "title":"坚瑞沃能前三季预亏294400-294900万",
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                "category":"头条",
                "author_name":"中国发展网",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017093004941.html",
                "thumbnail_pic_s":"http:\/\/07imgmini.eastday.com\/mobile\/20181017\/20181017093004_976bd1cf9b7790efd96e1ef950234b3e_1_mwpm_03200403.jpg"
            },
            {
                "uniquekey":"c0237379b0dc5907dcaad893a8629ca3",
                "title":"不想吃饭就来吃拌面吧,10种超好吃的拌面做法,学会做给老公吃!",
                "date":"2018-10-17 09:29",
                "category":"头条",
                "author_name":"三叔日食记",
                "url":"http:\/\/mini.eastday.com\/mobile\/181017092958385.html",
                "thumbnail_pic_s":"http:\/\/01imgmini.eastday.com\/mobile\/20181017\/20181017092958_ceea58d525367d04016d3c837495bd64_9_mwpm_03200403.jpg",
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            }
        ]
    },
    "error_code":0
}
news.json (源代码)

 

习题:把news.json中的新闻数据提取出来打印控制台
with open("news.json","rt",encoding="utf-8") as f:
    res = json.load(f)
    print(type(res))
    for dic in res["result"]["data"]:
        for key in dic:
            print("%s:%s"%(key,dic[key]))

 

python脱产4期内容整理NO.21

原文:https://www.cnblogs.com/wuzhengzheng/p/9813134.html

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