【pyhon】nvshens图片批量下载爬虫1.01

得到要下载的图片列表后，1.00版本的做法是循序下载，这在网络通畅时没问题，遇到故障时就容易丢失文件；而1.01版本是从队列尾部取值，下载不成功再塞回去重新下，这样能把图片下全。

# nvshens图片批量下载爬虫1.01
# 原先版本在遇到网络故障时回下载不全，这回更改了模式使得下载不成就重新下载，直到全部下载完毕
from bs4 import BeautifulSoup
import requests
import time
import urllib.request

user_agent='Mozilla/4.0 (compatible;MEIE 5.5;windows NT)'
headers={'User-Agent':user_agent}

# 找到的图片
pictures=[]

# 不断追逐，直到结束
def crawl(url):
    print("爬取页面"+url);

    try:
        rsp=requests.get(url,headers=headers)
        soup= BeautifulSoup(rsp.text,'html.parser',from_encoding='utf-8')
        nextUrl="none";

        for divs in soup.find_all(class_="gallery_wrapper"):
            # 把找到的图片放到数组里去
            for img in divs.find_all('img'):
                print(img.get("src"))
                pictures.append(img.get("src"))

            #找下一页
            for link in divs.find_all('a',class_='a1'):
                if link.string=='下一页' and link.get("href").find('.html')!=-1:
                    nextUrl='https://www.nvshens.com'+link.get("href");

        #if len(pictures)>10:
        #    downloadPics()

        #time.sleep(5)

        if nextUrl!="none":
            print("前往下一页");
            crawl(nextUrl)
        else:
            print('爬取结束，开始下载...')
            downloadPics()
            print('下载结束，nvshens图片批量下载爬虫工作完毕.')
    except Exception as e:
        print("发生异常。重新爬行")# 不管怎么出现的异常，就让它一直爬到底
        crawl(url)

# 下载图片到本地
def downloadPics():
    while(len(pictures)>0):
        pic=pictures.pop()

        name=pic.split('/')[-1]

        try:
            rsp=urllib.request.urlopen(pic)
            img=rsp.read()
            with open(name,'wb') as f:
                f.write(img)
            print('图片'+pic+'下载完成')
        except Exception as e:
            print('图片'+pic+'下载异常,塞回重试')
            pictures.append(pic);

# Kickoff Start
# https://www.nvshens.com/g/22268/
crawl('https://www.nvshens.com/g/22210/')

输出：

C:\Users\horn1\Desktop\python\7>python downloadall.py
爬取页面https://www.nvshens.com/g/22210/
C:\Users\horn1\AppData\Local\Programs\Python\Python36\lib\site-packages\bs4\__init__.py:146: UserWarning: You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.
  warnings.warn("You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.")
https://img.onvshen.com:85/gallery/23789/22210/s/0.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/001.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/002.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/003.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/004.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/2.html
https://img.onvshen.com:85/gallery/23789/22210/s/005.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/006.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/007.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/008.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/009.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/3.html
https://img.onvshen.com:85/gallery/23789/22210/s/010.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/011.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/012.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/013.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/014.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/4.html
https://img.onvshen.com:85/gallery/23789/22210/s/015.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/016.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/017.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/018.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/019.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/5.html
https://img.onvshen.com:85/gallery/23789/22210/s/020.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/021.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/022.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/023.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/024.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/6.html
https://img.onvshen.com:85/gallery/23789/22210/s/025.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/026.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/027.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/028.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/029.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/7.html
https://img.onvshen.com:85/gallery/23789/22210/s/030.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/031.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/032.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/033.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/034.jpg
前往下一页
爬取页面https://www.nvshens.com/g/22210/8.html
https://img.onvshen.com:85/gallery/23789/22210/s/035.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/036.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/037.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/038.jpg
https://img.onvshen.com:85/gallery/23789/22210/s/039.jpg
爬取结束，开始下载...
图片https://img.onvshen.com:85/gallery/23789/22210/s/039.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/039.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/038.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/038.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/038.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/037.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/036.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/036.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/035.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/034.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/033.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/032.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/031.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/030.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/029.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/028.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/028.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/027.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/027.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/026.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/025.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/025.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/025.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/024.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/024.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/024.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/023.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/022.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/022.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/021.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/020.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/019.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/019.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/019.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/019.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/018.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/018.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/018.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/017.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/016.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/015.jpg下载完成
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图片https://img.onvshen.com:85/gallery/23789/22210/s/013.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/012.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/011.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/010.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/009.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/008.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/008.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/008.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/007.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/006.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/005.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/005.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/005.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/005.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/005.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/004.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/003.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/002.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/001.jpg下载完成
图片https://img.onvshen.com:85/gallery/23789/22210/s/0.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/0.jpg下载异常,塞回重试
图片https://img.onvshen.com:85/gallery/23789/22210/s/0.jpg下载完成
下载结束，nvshens图片批量下载爬虫工作完毕.

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