爬虫（20）：深度爬取策略（2）

import re
import requests

headers = {
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36"}

"""
世界杯八强出炉
"""


def getUrl(url):
    html = getHtml(url)
    urlre = "\"(https?://.*?)\".*>"
    urllist = re.findall(urlre, html)
    return urllist


def getHtml(url):
    response = requests.get(url, headers=headers).content.decode('utf-8', 'ignore')
    return response


def vastSpider(depth):
    while len(urlList) > 0:
        url = urlList.pop()

        if urlDict[url] <= depth:
            print('\t\t\t\t' * urlDict[url], '这是第%d层，%s' % (urlDict[url], url))

            sonurlList = getUrl(url)
            for newurl in sonurlList:
                if newurl not in urlDict:
                    urlDict[newurl] = urlDict[url] + 1
                    urlList.append(newurl)


if __name__ == '__main__':
    startUrl = 'https://www.baidu.com/s?wd=世界杯'

    urlList = []
    urlList.append(startUrl)

    urlDict = {}
    urlDict[startUrl] = 1

    vastSpider(4)