实战：使用PyQuery和Requests爬取美女图片

前提：已安装request库、PyQuery、mongodb、pymongo

##config文件
MONGO_URL = 'localhost'
MONGO_DB = 'uumtu'
MONGO_TABLE = 'uumtu'
KEYWORD='mxmn'

import requests
from requests.exceptions import RequestException
from pyquery import PyQuery as pq
import re
from config import *
import pymongo
from hashlib import md5
import os
from multiprocessing import Pool

client = pymongo.MongoClient(MONGO_URL, connect=False)
db = client[MONGO_DB]

baseurl = 'https://www.uumnt.cc'

def get_page_index(offset,keyword):
    """
    这个函数返回指定主题、页码的html内容
    :param offset: 这个主题中的第几页
    :param keyword: 哪一个主题
    :return:
    """
    if offset != 1:
        url = 'https://www.uumnt.cc/%s/%s'%(str(keyword),'list_%s.html'%str(offset))
    else:
        url = 'https://www.uumnt.cc/%s'%(str(keyword),)

    print(url)
    try:

        response = requests.get(url)
        if response.status_code == 200:
            return response.text
        return None
    except RequestException:
        print('请求页面出错')


def parse_page_index(html):
    """

    :param html: 传入的html是包含很多组图的入口页面
    :return: 返回url的生成器
    #contbody > div:nth-child(7) > div > h1
    """
    #try:
    doc = pq(html)
    labelAs = doc('#mainbodypul .listmainrows')
    #print(type(labelAs.find('a')))
    for aa in labelAs.find('a'):
        a1=pq(aa)
        yield baseurl  + a1.attr.href


def save_pic(content):
    file_path = '{0}/{1}.{2}'.format(os.getcwd()+"/minxin", md5(content).hexdigest(), 'jpg')
    print(file_path)
    if not os.path.exists(file_path):
        with open(file_path, 'wb') as f:
            f.write(content)
            f.close()

def download_image(url):
    print(url)
    try:
        response = requests.get(url)
        if response.status_code == 200:
            html = pq(response.text)
            src = html('div.center a img').attr.src
            print(src)
            print('Downloading image ',url)
            '''
            https://newimg.uumnt.cc:8092/Pics/2017/1112/02/02.jpg
            https://newimg.uumnt.cc:8092/Pics/2017/1120/09/01.jpg
            '''
            headers = {
                'referer': 'https://www.uumtu.com/siwa/23573_3.html',
                'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'
            }
            image_page = requests.get(src,headers=headers)#打开真正的图片
            print(image_page.headers)
            if image_page.status_code == 200:
                save_pic(image_page.content)
        return None
    except RequestException:
        print('请求页面出错')

def get_page_detail(url):
    try:
        response = requests.get(url)
        if response.status_code == 200:
            doc = pq(response.text)

            h1_text = (doc('div.center h1.center').text())
            print(h1_text)
            titlePatten = re.compile('(.*?)\(.*?\/(\d+)\)', re.S)
            mymatch = re.search(titlePatten, h1_text)
            #print(title1.group(1),title1.group(2))
            title=mymatch.group(1)
            count = int(mymatch.group(2))
            image_urls =[]

            for i in range(1,count):
                pass
                image_urls.append(url[:-5] + '_' + str(i) + '.html')
            return {
                'title':title,
                'count':count,
                'url':url,
                'images':image_urls
            }
        return None
    except RequestException:
        print('请求页面出错')

def save_to_mongo(result):
    if db[MONGO_TABLE].insert(result):
        print('Successfully Saved to Mongo', result)
        return True
    return False

def main(offset):

    response = get_page_index(offset,KEYWORD)
    for a in parse_page_index(response):
        mydic = get_page_detail(a)
        if mydic:
            save_to_mongo(mydic)
            lenth = len(mydic['images'])
            for index in range(lenth):
                download_image(mydic['images'][index])
if __name__ == '__main__':
    pool = Pool()
    #groups = ([x * 20 for x in range(GROUP_START, GROUP_END + 1)])
    #pool.map(main, groups)
    groups = ([x+1 for x in range(82)])
    print(groups)
    pool.map(main, groups)
    pool.close()
    pool.join()