纪第一个Python爬虫——爬取指定页数淘宝商品的价格名称等并存入csv文件

代码如下:

"""
Created on Thu Jun 10 21:42:17 2021

@author: 泥烟

本爬虫可实现指定商品,指定页数的信息爬取,仅用来学习
具有时效性(cookie会过期,用的时候手动改一下即可)
"""


import requests
import re
import csv
import time

count=1
#步骤1：提交商品搜索请求，循环获取页面
def getHTMLText(url):
    me = {'cookie':'略',
          'User-agent':'Mozilla/5.0'}
    try:
        r = requests.get(url, headers=me,timeout=30)
        r.raise_for_status()
        r.encoding = r.apparent_encoding
        return r.text
    except:
        return ""

#步骤2：对于每个页面，提取商品序号,名称和价格信息
def parsePage(ilt, html,page):
    try:
        plt = re.findall(r'"view_price":"[d.]*"', html)
        tlt = re.findall(r'"raw_title":".*?"', html)
        #每页第一个商品的序号
        global count
        for i in range(len(plt)):
            price = eval(plt[i].split(':')[1])
            title = eval(tlt[i].split(':')[1])
            ilt.append([count,price, title])
            count+=1
    except:
        print("")


def main():
    print('输入要爬取的商品名字:')
    goods = input()
    print("输入要爬取的页数(仅做练习,请尽量少于10页):")
    depth = int(input())
    basic_url = 'https://s.taobao.com/search?q=' + goods
    uList = []
    header = ["序号", "价格", "商品名称"]

    for i in range(depth):
        try:
            url = basic_url + '&s=' + str(44 * i)
            html = getHTMLText(url)
            parsePage(uList, html,i)
            print("第"+str(i+1)+"页爬取成功")
            time.sleep(0.5)
        except:
            continue
    filename = goods+".csv"
    #步骤3：将信息保存在文件中,文件名为该商品的名字
    with open(filename, 'a', newline='') as f:
        writer  = csv.writer(f)
        writer.writerow(header)
        for row in uList:
            writer.writerow(row)

if __name__ == '__main__':
    main()
    print("输入回车退出...")
    input()