import urllib.request
from lxml import etree

# (1) 请求对象的定制
# (2) 获取网页的源码
# (3) 下载

# 需求 下载的前十页的图片
# https://sc.chinaz.com/tupian/qinglvtupian.html   1
# https://sc.chinaz.com/tupian/qinglvtupian_page.html


def create_request(page):
    if (page == 1):
        url = 'https://sc.chinaz.com/tupian/qinglvtupian.html'
    else:
        url = 'https://sc.chinaz.com/tupian/qinglvtupian_' + str(page) + '.html'
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36'
    }
    request = urllib.request.Request(url=url, headers=headers)
    return request

def get_content(request):
    response = urllib.request.urlopen(request)
    content = response.read().decode("utf-8")
    return content

def down_load(content):
    # urllib.request.urlretrieve('图片地址','文件的名字')
    tree = etree.HTML(content)
    name_list = tree.xpath("//div[@id='container']//a/img/@alt")
    # 一般设计图片的网站会对图片进行懒加载
    src_list = tree.xpath("//div[@id='container']//a/img/@src2")

    for i in range(len(name_list)):
        name = name_list[i]
        src = src_list[i]
        url = "https:" +src
        print(name, "   ", url)
        urllib.request.urlretrieve(url=url, filename="./img/" + name + ".jpg")



if __name__ == '__main__':
    start_page = int(input('请输入起始页码'))
    end_page = int(input('请输入结束页码'))

    for page in range(start_page,end_page+1):
        # (1) 请求对象的定制
        request = create_request(page)
        # （2）获取网页的源码
        content = get_content(request)
        # （3）下载
        down_load(content)