python3爬虫-通过requests爬取图虫网

Posted 2021-10-23 zhuchunyu

import requests
from fake_useragent import UserAgent
from requests.exceptions import Timeout
from urllib.parse import quote, unquote
import re, json, os, hashlib
from lxml import etree
import time
from multiprocessing import Process, Queue, Pool     # 之前想使用多进程，通过队列处理图片下载。没有实现

userAgent = UserAgent()
headers = {
    "User-Agent": userAgent.random,
    "Host": "tuchong.com",
    "Referer": "https://tuchong.com/explore/"
}
baseUrl = "https://tuchong.com/rest/tag-categories/"
baseTagUrl = "https://tuchong.com/rest/tags/"
tagReferer = "https://tuchong.com/tags/"

timeout = 5
s = requests.Session()

dic = {
    "subject": [],
    "style": [],
    "equipment": [],
    "location": [],
}

categoriesDict = {
    "subject": "题材",
    "style": "风格",
    "equipment": "器材",
    "location": "地区",
}


def getCategoryPage(url, category, page=1):
    try:
        url = url + category
        params = {
            "page": page,
            "count": 20
        }
        response = s.get(url=url, headers=headers, timeout=timeout, params=params)
        if response.status_code == 200:
            response.category = category
            return response
    except Timeout as e:
        print(e)
        return None


def getTagNameUrl(response):
    if not response:
        return None
    data_dict = response.json()
    tag_list = data_dict.get("data").get("tag_list")
    tag_name_list = [tag.get("tag_name") for tag in tag_list]
    return tag_name_list


def getNextPageUrl(response):
    if not response:
        return []
    data_dict = response.json()
    pages = int(data_dict.get("data").get("pages"))
    for page in range(2, pages + 1):
        yield page


def getAllTag():
    global dic
    s.get(url="https://tuchong.com/explore/", headers=headers, timeout=timeout)
    for category in categoriesDict.keys():
        print("获取 -{}- 第 <{}> 页tagName信息.........".format(categoriesDict.get(category), 1))
        response = getCategoryPage(url=baseUrl, category=category)
        tag_name_list = getTagNameUrl(response) or []
        dic.get(category).extend(tag_name_list)
        time.sleep(1)
        for page in getNextPageUrl(response):
            print("获取 -{}- 第 <{}> 页tagName信息.........".format(categoriesDict.get(category), page))
            response = getCategoryPage(url=baseUrl, category=category, page=page)
            tag_name_list = getTagNameUrl(response) or []
            dic.get(category).extend(tag_name_list)
            time.sleep(1)


def getTagPage(url, tag, page):
    tag = quote(tag)
    url = url + tag + "/posts"
    params = {
        "page": page,
        "count": 20,
        "order": "weekly"
    }
    headers["Referer"] = tagReferer + tag + "/"
    try:
        response = requests.get(url=url, params=params, headers=headers, timeout=timeout)
        if response.status_code == 200:
            return response
    except Timeout as e:
        print(e)
        return None


def getImagesInfo(response):
    print(‘---‘)
    if not response:
        return None
    result = response.json().get("result")
    if result == "INVALID":
        print("数据取完了")
        return None
    postList = response.json().get("postList")
    imageUrlList = [dic.get("url") for dic in postList]
    titleList = [dic.get("title").strip() for dic in postList]
    for img_url_title in zip(titleList, imageUrlList):
        img_url_title = list(img_url_title)
        yield img_url_title


def get_md5(img_url):
    m = hashlib.md5()
    m.update(bytes(img_url, encoding="utf-8"))
    return m.hexdigest()


def download(imgsUrl):
    if imgsUrl:
        for img_url in imgsUrl:
            response = requests.get(url=img_url)
            name = get_md5(img_url)
            print("正在下载{}...".format(img_url))
            with open(os.path.join(BASE_PATH, name) + ".jpg", "wb") as f:
                f.write(response.content)


def gogo(tagname):
    page = 1
    while True:
        response = getTagPage(url=baseTagUrl, tag=tagname, page=page)
        print("开始爬取 {} 第 {} 页...".format(tagname, page))
        info = getImagesInfo(response) or []
        if not response:
            return
        for info_tuple in info:
            imgsUrl = putImageUrl(info_tuple)
            download(imgsUrl)
        page += 1
        time.sleep(5)


def putImageUrl(img_url_title_list):
    if img_url_title_list:
        img_url = img_url_title_list[1]
        try:
            response = s.get(url=img_url, headers=headers, timeout=timeout)
            html = etree.HTML(response.text)
            imgsUrl = html.xpath("//article[@class=‘post-content‘]/img/@src")
            return imgsUrl
        except requests.exceptions.ConnectionError as e:
            print(e)
            return None


def downloadImage():
    for key in dic:
        tagname_list = dic.get(key)
        for tagname in tagname_list:
            gogo(tagname)


def run():
    getAllTag()
    print("所有tag信息获取完毕.........")
    print("开始获取每个tag的内容.........")
    downloadImage()


if __name__ == ‘__main__‘:
    BASE_PATH = r"D:\tuchong"
    run()