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View Code? Open in Web Editor NEW利用requests和lxml爬取妹子图片网
利用requests和lxml爬取妹子图片网
代码中 image_amount = selector.xpath("//div[@class='page']/a[last()-2]/text()")[0]
应该改为 image_amount = selector.xpath("//div[@class='page']/a[last()-1]/text()")[0]
否则 image_amount
取到的其实是倒数第三个,即6.
make some little changes:
import requests
import os
from lxml import html
def get_page_number(num):
#构建函数,用来查找该页内所有图片集的详细地址。目前一页包含15组套图,所以应该返回包含15个链接的序列。
url = 'http://www.mmjpg.com/home/' + str(num)
#构造每个分页的网址
response = requests.get(url).content
#调用requests库,获取二进制的相应内容。注意,这里使用.text方法的话,下面的html解析会报错,大家可以试一下。这里涉及到.content和.text的区别了。简单说,如果是处理文字、链接等内容,建议使用.text,处理视频、音频、图片等二进制内容,建议使用.content。
selector = html.fromstring(response)
#使用lxml.html模块构建选择器,主要功能是将二进制的服务器相应内容response转化为可读取的元素树(element tree)。lxml中就有etree模块,是构建元素树用的。如果是将html字符串转化为可读取的元素树,就建议使用lxml.html.fromstring,毕竟这几个名字应该能大致说明功能了吧。
urls = []
#准备容器
for i in selector.xpath("//ul/li/a/@href"):
#利用xpath定位到所有的套图的详细地址
urls.append(i)
#遍历所有地址,添加到容器中
return urls
#将序列作为函数结果返回
def get_image_title(url):
#现在进入到套图的详情页面了,现在要把套图的标题和图片总数提取出来
response = requests.get(url).content
selector = html.fromstring(response)
image_title = selector.xpath("//h2/text()")[0]
#需要注意的是,xpath返回的结果都是序列,所以需要使用[0]进行定位
return image_title
def get_image_amount(url):
#这里就相当于重复造轮子了,因为基本的代码逻辑跟上一个函数一模一样。想要简单的话就是定义一个元组,然后把获取标题、获取链接、获取图片总数的3组函数的逻辑揉在一起,最后将结果作为元组输出。不过作为新手教程,还是以简单易懂为好吧。想挑战的同学可以试试写元组模式
response = requests.get(url).content
selector = html.fromstring(response)
image_amount = selector.xpath("//div[@class='page']/a[last()-2]/text()")[0]
# a标签的倒数第二个区块就是图片集的最后一页,也是图片总数,所以直接取值就可以
return image_amount
def get_image_detail_website(url):
#这里还是重复造轮子。
response = requests.get(url).content
selector = html.fromstring(response)
image_detail_websites = []
image_amount = selector.xpath("//div[@class='page']/a[last()-2]/text()")[0]
#这里重复构造变量,主要是为了获取图片总数。更高级的方法是使用函数间的传值,但是我忘了怎么写了,所以用了个笨办法。欢迎大家修改
#构建图片具体地址的容器
for i in range(int(image_amount)):
image_detail_link = '{}/{}'.format(url, i+1)
response = requests.get(image_detail_link).content
sel = html.fromstring(response)
image_download_link = sel.xpath("//div[@class='content']/a/img/@src")[0]
#这里是单张图片的最终下载地址
image_detail_websites.append(image_download_link)
return image_detail_websites
def download_image(image_title, image_detail_websites, page_number):
#将图片保存到本地。传入的两个参数是图片的标题,和下载地址序列
num = 1
amount = len(image_detail_websites)
imgDir = 'page_' + str(page_number)
if not os.path.exists(imgDir):
os.makedirs(imgDir)
#获取图片总数
for i in image_detail_websites:
filename = imgDir + '/%s%s.jpg' % (image_title, num)
print('正在下载图片:%s第%s/%s张,' % (image_title, num, amount))
with open(filename, 'wb') as f:
f.write(requests.get(i).content)
num += 1
if __name__ == '__main__':
page_range = input('请输入需要爬取的页码范围(Ex: 10-15):')
page_range = page_range.split('-')
page_range = list(range(int(page_range[0]), int(page_range[1])+1))
for page_number in page_range:
for link in get_page_number(page_number):
download_image(get_image_title(link), get_image_detail_website(link), page_number)
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