简单小爬虫

本文主要是介绍简单小爬虫，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

爬虫代码仅用于学习

1. 壁纸下载

import requests
url = 'https://pic.netbian.com/uploads/allimg/210519/003255-1621355575e57d.jpg'
res = requests.get(url)
with open(r'D:\Downloads\女仆.jpg','wb') as f:
    f.write(res.content)
print('保存成功...')

2. 站长之家图片链接

import requests
from bs4 import BeautifulSoup
import csv
import time


file = open('图片链接.csv', 'a', encoding='utf-8-sig', newline='')
file_csv = csv.writer(file)
file_csv.writerow( ['图片名称', '图片链接'] )


#请求链接
url = "https://sc.chinaz.com/tupian/"
#请求头
headers = {
    # 浏览器标识
    "User-Agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36"
}
#开始请求
response = requests.get(url, headers=headers)
# 设置编码方式  为了避免出现编码乱码问题
response.encoding = 'utf-8'
# 创建bs4对象
soup = BeautifulSoup(response.text, 'html.parser') # lxml
# 定位总的分类标签
all_a_list = soup.find('div', attrs={"class":"mt10 feilei"}).find_all('a')
for a in all_a_list:
    time.sleep(1)
    # https://sc.chinaz.com
    href = a.get('href')
    name = a.get('title')
    temp = href.split('.')
    for i in range(1,4):
        if i == 1:
            res_href = 'https://sc.chinaz.com' + href
            print('第一页------------------------')
        else:
            res_href = 'https://sc.chinaz.com' + temp[0] + '_' + str(i) + '.html'
            print('第{}页-----'.format(i))

        # 开始请求分类页面
        feilei_response = requests.get(res_href, headers=headers)
        feilei_response.encoding = 'utf-8'
        # 创建bs4对象
        feilei_soup = BeautifulSoup(feilei_response.text, 'html.parser')  # lxml
        all_p_list = feilei_soup.find('div', attrs={'id':'container'}).find_all('p')
        for p in all_p_list:
            a = p.find('a')
            a_href = a.get('href')
            a_name = a.get('alt')
            a_href_res = 'https:' + a_href

            # 请求获取图片页面 imga
            img_response = requests.get(a_href_res, headers=headers)
            img_response.encoding='utf-8'
            # 创建bs4对象
            img_soup = BeautifulSoup(img_response.text, 'html.parser')  # lxml
            imga = img_soup.find('div',attrs={"class":"imga"}).find('a').get('href')
            img = 'https:' + imga
            print(img)  # 最终的图片链接
            file_csv.writerow( [a_name, img] )
    break

3. 视频下载

stream = True时（默认是False），它不会立即进行下载，而是在使用 iter_content 进行遍历时按指定的块大小进行下载，这样在下载大文件时可以防止占用过多内存。

import requests
import os
root = r'D:\Downloads\movie'
path = root + os.sep + 'Beyond-喜欢你.mp4'
url = 'https://upos-sz-mirrorcos.bilivideo.com/upgcxcode/70/10/3711070/3711070-1-208.mp4?e=ig8euxZM2rNcNbNB7WdVhwdlhbUBhwdVhoNvNC8BqJIzNbfq9rVEuxTEnE8L5F6VnEsSTx0vkX8fqJeYTj_lta53NCM=&uipk=5&nbs=1&deadline=1631641391&gen=playurlv2&os=cosbv&oi=2054344254&trid=0386c5cd40b84401a8c0485a286ac1c0T&platform=html5&upsig=67a2ddc104c6b555ce2bac0d32e32980&uparams=e,uipk,nbs,deadline,gen,os,oi,trid,platform&mid=0&bvc=vod&nettype=0&orderid=0,1&logo=80000000#vp'
hd = {
    "user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
}
os.mkdir(root)
r = requests.get(url,headers=hd,stream=True)
content_size = int(r.headers['content-length'])
n = 1
with open(path,"wb") as f:
    for chunk in r.iter_content(chunk_size=1024):
        rate = n*1024/content_size
        print("\r下载进度：{0:%}".format(rate),end='')
        f.write(chunk)
        n += 1
    print("下载完成")

代码不定期更新

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