2、python之爬虫css属性解析以及2级爬取

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import pathlib
import uuid
from requests import get
from scrapy.selector import Selector


urlHttp = "https://www.51moot.net"
count = 0
for index_page in range(0, 5):
    html = get(
        "https://www.51moot.net/main/course?search_id=0&is_free=-1&page_index={0}".format(index_page)).content.decode(
        "utf-8")
    sel = Selector(text=html)
    result = sel.css("div.course-details-cont-view ul li a::attr(href)").extract()
    for x in result:
        x = urlHttp + x
        html = get(x).content.decode("utf-8")
        sel = Selector(text=html)
        strInfo = ""
        title = sel.css("div.course-details-title-cont-text h2::text").extract()[0]
        infos = sel.css(
            "div.course-details-title-cont-text li.course-details-title-cont-text-chapter span::text").extract()
        introduce = sel.css(
            "div.course-details-view-list div.course-details-view-list-introduce-cont p::text").extract()[0]
        strInfo += title + "n"
        strInfo += "主讲人：{0}t章节数：{1}t学习时长：{2}课时t学习人数：{3}人n".format(infos[0], infos[1], infos[2], infos[3])
        strInfo += "课程简介:{0}".format(introduce)
        try:
            saveUrl = str.format("D:/save51Moot/{0}{1}", title, ".txt")
            path = pathlib.Path(saveUrl)
            if path.exists():
                saveUrl = str.format("D:/save51Moot/{0}{1}{2}", title, uuid.uuid4(), ".txt")
            file = open(saveUrl, "w", encoding="utf-8")
            file.write(strInfo)
            file.close()
            count += 1
        except:
            print("异常链接:", x)
print("共计保存文件：", count, "个")