作业①

实验要求

·在中国气象网（http://www.weather.com.cn）给定城市集的7日天气预报，并保存在数据库。
Gitee作业1链接

实验内容:


from bs4 import BeautifulSoup
from bs4 import UnicodeDammit
import urllib.request
import sqlite3


class WeatherDB:
    def openDB(self):
        self.con = sqlite3.connect("weathers.db")
        self.cursor = self.con.cursor()
        try:
            self.cursor.execute("create table weathers (wCity varchar(16), wDate varchar(16), wWeather varchar(64), "
                                "wTemp varchar(32), constraint pk_weather primary key(wCity, wDate))")
        except:
            self.cursor.execute("delete from weathers")

    def closeDB(self):
        self.con.commit()
        self.con.close()

    def insert(self, city, date, weather, temp):
        try:
            self.cursor.execute("insert into weathers (wCity, wDate, wWeather, wTemp)values(?, ?, ?, ?)",
                                (city, date, weather, temp))
        except Exception as err:
            print(err)

    def show(self):
        self.cursor.execute("select * form weathers")
        rows = self.cursor.fetchall()
        print("%-16s%-16s%-32s%-16s" % ("city", "date", "weather", "temp"))
        for row in rows:
            print("%-16s%-16s%-32s%-16s" % (row[0], row[1], row[2], row[3]))


class WeatherForecast:
    def __init__(self):
        self.headers = {"User-Agent": "Mozilla/5.0"}
        self.cityCode = {"北京": "101010100", "上海": "101020100", "广州": "101280101", "深圳": "101280601"}

    def forecastCity(self, city):
        if city not in self.cityCode.keys():
            print(city + " code cannot be found")
            return

        url = "http://www.weather.com.cn/weather/" + self.cityCode[city] + ".shtml"
        try:
            req = urllib.request.Request(url, headers=self.headers)
            data = urllib.request.urlopen(req)
            data = data.read()
            dammit = UnicodeDammit(data, ["utf-8", "gbk"])
            data = dammit.unicode_markup
            soup = BeautifulSoup(data, "lxml")
            lis = soup.select("ul[class='t clearfix'] li")
            for li in lis:
                try:
                    date = li.select('h1')[0].text
                    weather = li.select('p[class="wea"]')[0].text
                    temp = li.select('p[class="tem"] span')[0].text + "/" + li.select('p[class="tem"] i')[0].text
                    print(city, date, weather, temp)
                except Exception as err:
                    print(err)
        except Exception as err:
            print(err)

    def process(self, cities):
        self.db = WeatherDB()
        self.db.openDB()

        for city in cities:
            self.forecastCity(city)

        # self.db.show()
        self.db.closeDB()


ws = WeatherForecast()
ws.process(["北京", "上海", "广州", "深圳"])
print("completed")

运行结果：

心得体会：

通过对课例的实践，对bs库有了更深的认识

作业②

实验要求：

·要求：用 requests 和 BeautifulSoup 库方法定向爬取股票相关信息，并存储在数据库中。
·技巧：在谷歌浏览器中进入 F12 调试模式进行抓包，查找股票列表加载使用的 url，并分析 api 返回的值，并根据所要求的参数可适当更改api 的请求参数。根据 URL 可观察请求的参数 f1，f2 可获取不同的数值，根据情况可删减请求的参数。
Gitee作业2链接

实验内容：

import requests,re
import json

def count(s):
    return len([ch for ch in s if '\u4e00' <= ch <= '\u9fff'])

cnt = 3  
print("{:<3} {:<5} {:<6} {:<4} {:<5} {:<5} {:<8} {:<9} {:<4} {:<5} {:<4} {:<5} {:<5}".format(
    "序号", "股票代码", "股票名称", "最新报价", "涨跌幅", "涨跌额", "成交量", "成交额", "振幅", "最高", "最低", "今开", "昨收"))
for i in range(cnt):

    url = "http://41.push2.eastmoney.com/api/qt/clist/get?cb=jQuery112408942134990117723_1601810673881&pn=" + \
        str(i+1)+"&pz=20&po=1&np=1&ut=bd1d9ddb04089700cf9c27f6f7426281&fltt=2&invt=2&fid=f3&fs=m:0+t:6,m:0+t:13,m:0+t:80,m:1+t:2,m:1+t:23"
    r = requests.get(url)
    r.encodingn = "UTF-8"
    text = r.text[r.text.index("["):]
    
    datas = re.findall("{.*?}", text)
    for j in range(len(datas)):
        data = json.loads(datas[j])
        temp = "{:<5} {:<8} {:<"+str(10-count(
            data['f14']))+"} {:<7} {:<7} {:<7} {:<8} {:<13} {:<6} {:<6} {:<6} {:<6} {:<6}"
        print(temp.format(i*20+j+1, data['f12'], data['f14'], data['f2'], data['f3'], data['f4'],
                          data['f5'], data['f6'], data['f7'], data['f15'], data['f16'], data['f17'], data['f18']))

运行结果：

心得体会：

通过作业2，让我加深了抓取网页加载的js的url链接的使用，以及根据分析url的结构以及根据自己的需求可以对其进行修改来获取指定信息。

作业 ③

实验要求：

·要求：爬取中国大学 2021 主榜（https://www.shanghairanking.cn/rankings/bcur/2021）所有院校信息，并存储在数据库中，同时将浏览器 F12 调试分析的过程录制 Gif 加入至博客中。
·技巧：分析该网站的发包情况，分析获取数据的 api
Gitee作业3链接

实验内容：

调试分析过程

import requests
from bs4 import BeautifulSoup
import bs4
def getHTMLText(url):
    r=requests.get(url,timeout=30)
    r.raise_for_status()
    r.encoding=r.apparent_encoding
    return r.text


def fillUnivList(ulist,html):
    soup=BeautifulSoup(html,"html.parser")
    for tr in soup.find('tbody').children:
        if isinstance(tr,bs4.element.Tag):
            tds=tr('td')
            tbs=tr('a')
        ulist.append([tds[0].text.strip(),tbs[0].text.strip(),tds[-2].text.strip()])
    pass


def printUnivList(ulist,num):
    tplt="{0:^10}\t{1:{3}^10}\t{2:^10}"
    print(tplt.format("排名","学校名称","总分",chr(12288)))
    for i in range(num):
        u=ulist[i]
        print(tplt.format(u[0],u[1],u[2],chr(12288)))


def main():
    ulnfo=[]
    url="https://www.shanghairanking.cn/rankings/bcur/2021"
    html=getHTMLText(url)
    fillUnivList(ulnfo,html)
    printUnivList(ulnfo,20)
main()