python爬虫完整代码

阳光穿透心脏的1/2处 2022-03-02 06:48 266阅读 0赞

复制粘贴，拿来直接跑就行，url之类的都不用改。

import urllib.request
    import urllib.parse
    import re
    import os
    #添加header，其中Referer是必须的,否则会返回403错误，User-Agent是必须的，这样才可以伪装成浏览器进行访问
    header=\
    {
         'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36',
         "referer":"https://image.baidu.com"
        }
    url = "https://image.baidu.com/search/acjson?tn=resultjson_com&ipn=rj&ct=201326592&is=&fp=result&queryWord={word}&cl=2&lm=-1&ie=utf-8&oe=utf-8&adpicid=&st=-1&z=&ic=0&word={word}&s=&se=&tab=&width=&height=&face=0&istype=2&qc=&nc=1&fr=&cg=girl&pn={pageNum}&rn=30&gsm=1e00000000001e&1490169411926="
    keyword = input("请输入搜索关键字：")
    #转码
    keyword = urllib.parse.quote(keyword,'utf-8')
    
    n = 0
    j = 0
    
    while(n<3000):
        error = 0
        n+=30
        #url
        url1 = url.format(word=keyword,pageNum=str(n))
        #获取请求
        rep = urllib.request.Request(url1,headers=header)
        #打开网页
        rep = urllib.request.urlopen(rep)
        #获取网页内容
        try:
            html = rep.read().decode('utf-8')
            # print(html)
        except:
            print("出错了！")
            error = 1
            print("出错页数："+str(n))
        if error == 1:
            continue
        #正则匹配
        p = re.compile("thumbURL.*?\.jpg")
        #获取正则匹配到的结果，返回list
        s = p.findall(html)
        if os.path.isdir(r"C:\Users\87419\Desktop\Pa") != True:
            os.makedirs(r"C:\Users\87419\Desktop\Pa")
        with open("testpic.txt","a") as f:
            #获取图片
            for i in s:
                print(i)
                i = i.replace('thumbURL":"','')
                print(i)
                f.write(i)
                f.write("\n")
                #保存图片
                urllib.request.urlretrieve(i,r"C:\Users\87419\Desktop\Pa/pic{num}.jpg".format(num=j))
                j+=1
            f.close()
    print("总共爬取图片数为："+str(j))

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