本次是股票定向爬取，从东方财富网上获取所有股票代码，然后在百度股票网上打开每个个股股票信息，提取所要保存的股票信息。采取的技术路线是re+bs4+requests。

import requests
from bs4 import BeautifulSoup
import traceback     #处理异常
import re


#获取页面的函数
def getHTMLText(url,code='utf-8'):              #这里编码事先查看网页的编码格式
    try:
        r=requests.get(url)
        r.raise_for_status()
        r.encoding = code
        return r.text
    except:
        return ""

#获取所有的股票代码保存在一个列表中
def getStockList(lst,stockURL):
    html = getHTMLText(stockURL,'GB2312')
    soup = BeautifulSoup(html,'html.parser')
    a = soup.find_all('a')
    for i in a:
        try:
            href = i.attrs['href']
            lst.append(re.findall(r"[s][hz]\d{6}",href)[0])
        except:
            continue


#获取每只个股股票的信息并保存到文件中,并显示保存爬取的进度
def getStockInfo(lst,stockURL,fpath):
    count = 0
    for stock in lst:
        url = stockURL + stock + '.html'
        html = getHTMLText(url)
        try:
            if html == "":
                continue
            infoDict = {}
            soup = BeautifulSoup(html,'html.parser')
            stockInfo = soup.find('div',attrs = {'class':'stock-bets'})
            name = stockInfo.find.all(attrs={'class':'bets-name'})[0]
            infoDict.update({'股票名称':name.text.split()[0]})

            keyList = stockInfo.find_all('dt')
            valueList = stockInfo.find_all('dd')
            for i in range(len(keyList)):
                  key = keyList[i].text
                  val = valueList[i].text
                  infoDict[key]=val
            
            with open(fpath,'a',encoding='utf-8') as f:
                  f.write(str(infoDict) + '\n')
                  count = count +1
                  print("\r当前进度:{:.2f}%".format(count*100/len(lst)),end="")
             except:
                  count = count +1
                  print("\r当前进度:{:.2f}%".format(count*100/len(lst)),end="")
                  continue



#主函数
def main()
    stock_list_url = 'http://quote.eastmoney.com/stocklist.html'
    stock_info_url = 'https://gupiao.baidu.com/stock/'
    output_file = 'D:/BaiduStockInfo.txt'
    slist = []
    getStockList(slist,stock_list_url)
    getStockInfo(slist,stock_info_url,output_file)

main()