1.MongoDB的安装

MongoDB是一种非关系型数据库

选择你的系统对应的版本下载安装即可

2.MongoDB配置

a.在C盘或者D盘建一个文件夹如图mongodb

b.安装成功后里面会有bin文件然后再文件夹里面新建一个data文件夹，data文件里面新建db文件夹

c.在bin文件路径下打开命令行工具执行下面的命令

mongod --dbpath C:\mongdb\data\db

d.此时在打开一个命令行在bin路径下执行下面的代码

mongo

3.安装第三方库pymongo(连接MongoDB)

pip3 install pymongo

4.安装Mongodb可视化管理工具Robomongo

安装成功之后启动Robomongo，在空白处点击，然后选择Add命令，单击Save,最后点击Connect按钮连接到MongoDB数据库

5.案例代码

引入相应的模块

import requestsfrom lxml import etreeimport reimport pymongoimport time

连接mongodb数据库

client = pymongo.MongoClient('localhost', 27017)mydb = client['mydb']musictop = mydb['musictop']

案例完整代码

import requestsfrom lxml import etreeimport reimport pymongoimport timeclient = pymongo.MongoClient('localhost', 27017)mydb = client['mydb']musictop = mydb['musictop']headers = {    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36'}def get_url_music(url):    html = requests.get(url, headers=headers)    selector = etree.HTML(html.text)    music_hrefs = selector.xpath('//a[@class="nbg"]/@href')    for music_href in music_hrefs:        get_music_info(music_href)def get_music_info(url):    html = requests.get(url, headers=headers)    selector = etree.HTML(html.text)    name = selector.xpath('//*[@id="wrapper"]/h1/span/text()')[0]    author = re.findall('表演者:.*?>(.*?)', html.text,re.S)[0]    styles = re.findall('流派: (.*?)
',html.text,re.S)    if len(styles) == 0:        style = '未知'    else:        style = styles[0].strip()    time = re.findall('发行时间: (.*?)
', html.text, re.S)[0].strip()    publishers = re.findall('出版者:.*?>(.*?)', html.text, re.S)    if len(publishers) == 0:        publishers = '未知'    else:        publishers = publishers[0].strip()    score = selector.xpath('//*[@id="interest_sectl"]/div/div[2]/strong/text()')[0]    print(name, author, style, time, publishers, score)    info = {        'name': name,        'author': author,        'style': style,        'time': time,        'publisher': publishers,        'score': score    }    musictop.insert_one(info)if __name__ == '__main__':    urls = ['https://music.douban.com/top250?start={}'.format(str(i)) for i in range(0, 250, 25)]    for url in urls:        get_url_music(url)        time.sleep(2)

6.执行爬虫代码，然后到Robomongo刷新就会看到数据已经有啦

7.本文只是入门级别，我分享出来希望和大家一起学习进步！ 我还写了Vue插件开发和抢红包的小游戏(欢迎Star)