爬取leetcode的题库

最新推荐文章于 2022-07-01 14:05:34 发布

原创最新推荐文章于 2022-07-01 14:05:34 发布 · 4.9k 阅读

8 ·

CC 4.0 BY-SA版权

python爬虫专栏收录该内容

2 篇文章

订阅专栏

本文介绍了一个用于抓取LeetCode网站题目详情的Python爬虫实现。该爬虫利用多线程技术并行处理，通过解析JSON数据获取题目列表，再逐一抓取每道题目的详细内容，包括题目描述及样例代码等。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

# coding:utf-8
import re
import json
import os
import threading
import time
import requests
from requests.exceptions import RequestException
from bs4 import BeautifulSoup


def get_proble_set(url):
    try:
        response = requests.get(url)
        if response.status_code == 200:
            return response.text
        return None
    except RequestException:
        return None
    
#for i in range(len(problemset)):

def parse_proble_set(problemSet):
    for i in range(len(problemSet)):
        title = problemSet[i]["stat"]["question__title_slug"]
        if title == "robot-room-cleaner":
            continue
        #construct_url(title)
        time.sleep(0.1)
        t =threading.Thread(target=construct_url,args=(title,))
        t.start()
        
        
def construct_url(problemTitle):
    url = "https://leetcode.com/problems/"+ problemTitle + "/description/"
    print(url+"\n")
    get_proble_content(url,problemTitle)

def save_problem(title,content):
    #content = bytes(content,encoding = 'utf8')
    filename = title + ".html"
    with open(filename,'w+',encoding="utf-8")as f:
        f.write(content)

    
def get_proble_content(problemUrl,title):
    response = requests.get(problemUrl)
    setCookie = response.headers["Set-Cookie"]
    '''
    print(setCookie)
    setCookie = json.loads(setCookie)
    print(type(setCookie))
    '''
    try:
        pattern = re.compile("csrftoken=(.*?);.*?",re.S)
        csrftoken = re.search(pattern, setCookie) 
        url = "https://leetcode.com/graphql"
        data = {"operationName":"getQuestionDetail",
                "variables":{"titleSlug":title},
                "query":"query getQuestionDetail($titleSlug: String!) {\n  isCurrentUserAuthenticated\n  question(titleSlug: $titleSlug) {\n    questionId\n    questionFrontendId\n    questionTitle\n    translatedTitle\n    questionTitleSlug\n    content\n    translatedContent\n    difficulty\n    stats\n    allowDiscuss\n    contributors\n    similarQuestions\n    mysqlSchemas\n    randomQuestionUrl\n    sessionId\n    categoryTitle\n    submitUrl\n    interpretUrl\n    codeDefinition\n    sampleTestCase\n    enableTestMode\n    metaData\n    enableRunCode\n    enableSubmit\n    judgerAvailable\n    infoVerified\n    envInfo\n    urlManager\n    article\n    questionDetailUrl\n    libraryUrl\n    companyTags {\n      name\n      slug\n      translatedName\n      __typename\n    }\n    companyTagStats\n    topicTags {\n      name\n      slug\n      translatedName\n      __typename\n    }\n    __typename\n  }\n  interviewed {\n    interviewedUrl\n    companies {\n      id\n      name\n      slug\n      __typename\n    }\n    timeOptions {\n      id\n      name\n      __typename\n    }\n    stageOptions {\n      id\n      name\n      __typename\n    }\n    __typename\n  }\n  subscribeUrl\n  isPremium\n  loginUrl\n}\n"
                }
        headers = {
            'x-csrftoken': csrftoken.group(1),
            'referer':problemUrl,
            'content-type':'application/json',
            'origin':'https://leetcode.com',
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36'
            }
        cookies = {'__cfduid':'d9ce37537c705e759f6bea15fffc9c58b1525271602',
                  '_ga':'GA1.2.5783653.1525271604',
                  '_gid':'GA1.2.344320119.1533189808',
                  'csrftoken':csrftoken.group(1),
                  ' _gat':'1'}
        #payload表单为json格式
        
        dumpJsonData = json.dumps(data)
        response = requests.post(url,data = dumpJsonData, headers = headers,cookies = cookies)
        dictInfo = json.loads(response.text)
        content = dictInfo["data"]["question"]["content"]
        soup = BeautifulSoup(content, 'lxml')
        save_problem(title,soup.prettify())
    except Exception as e:
        print(e)
        print("错误："+ problemUrl)
    
'''
    for string in soup.stripped_strings:
        print(string)
'''

def main():
    url = "https://leetcode.com/api/problems/all/"
    html = json.loads(get_proble_set(url))
    problemset = html["stat_status_pairs"]
    parse_proble_set(problemset)

    
if __name__=='__main__':
    if os.path.exists("算法题"):
        os.chdir("算法题")
    else:    
        os.mkdir("算法题")
        os.chdir("算法题")
    main()