Scrapy爬取猫眼《复仇者联盟4终局之战》影评

一.分析

首先简单介绍一下Scrapy的基本流程：

1. 引擎从调度器中取出一个链接(URL)用于接下来的抓取
2. 引擎把URL封装成一个请求(Request)传给下载器
3. 下载器把资源下载下来，并封装成应答包(Response)
4. 爬虫解析Response
5. 解析出实体（Item）,则交给实体管道进行进一步的处理
6. 解析出的是链接（URL）,则把URL交给调度器等待抓取
   
   

在网上找到了接口:http://m.maoyan.com/mmdb/comments/movie/248172.json?_v_=yes&offset=0&startTime=2019-02-05%2020:28:22，可以把offset的值设定为0，通过改变startTime的值来获取更
多的评论信息(把每页评论数据中最后一次评论时间作为新的startTime并构造url重新请求)（startTime=2019-02-05%2020:28:22这里的%20表示空格）

 

二.主要代码

items.py

import scrapy


class MaoyanItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    city = scrapy.Field()  # 城市
    content = scrapy.Field()  # 评论
    user_id = scrapy.Field()  # 用户id
    nick_name = scrapy.Field()  # 昵称
    score = scrapy.Field()  # 评分
    time = scrapy.Field()  # 评论时间
    user_level = scrapy.Field()  # 用户等级

　comment.py

import scrapy
import random
from scrapy.http import Request
import datetime
import json
from maoyan.items import MaoyanItem

class CommentSpider(scrapy.Spider):
    name = 'comment'
    allowed_domains = ['maoyan.com']
    uapools = [
        'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.163 Safari/535.1',
        'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20100101 Firefox/6.0',
        'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50',
        'Opera/9.80 (Windows NT 6.1; U; zh-cn) Presto/2.9.168 Version/11.50',
        'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; InfoPath.3)',
        'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB7.0)',
        'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)',
        'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)',
        'Mozilla/5.0 (Windows; U; Windows NT 6.1; ) AppleWebKit/534.12 (KHTML, like Gecko) Maxthon/3.0 Safari/534.12',
        'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)',
        'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E; SE 2.X MetaSr 1.0)',
        'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.33 Safari/534.3 SE 2.X MetaSr 1.0',
        'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)',
        'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.41 Safari/535.1 QQBrowser/6.9.11079.201',
        'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E) QQBrowser/6.9.11079.201',
        'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)',
        'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36',
        'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0'
    ]
    thisua = random.choice(uapools)
    header = {'User-Agent': thisua}
    current_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    current_time = '2019-04-24 18:50:22'
    end_time = '2019-04-24 00:05:00'  # 电影上映时间
    url = 'http://m.maoyan.com/mmdb/comments/movie/248172.json?_v_=yes&offset=0&startTime=' +current_time.replace(' ','%20')

    def start_requests(self):
        current_t = str(self.current_time)
        if current_t > self.end_time:
            try:
                yield Request(self.url, headers=self.header, callback=self.parse)
            except Exception as error:
                print('请求1出错-----' + str(error))
        else:
            print('全部有关信息已经搜索完毕')

    def parse(self, response):
        item = MaoyanItem()
        data = response.body.decode('utf-8', 'ignore')
        json_data = json.loads(data)['cmts']
        count = 0
        for item1 in json_data:
            if 'cityName' in item1 and 'nickName' in item1 and 'userId' in item1 and 'content' in item1 and 'score' in item1 and 'startTime' in item1 and 'userLevel' in item1:
                try:
                    city = item1['cityName']
                    comment = item1['content']
                    user_id = item1['userId']
                    nick_name = item1['nickName']
                    score = item1['score']
                    time = item1['startTime']
                    user_level = item1['userLevel']
                    item['city'] = city
                    item['content'] = comment
                    item['user_id'] = user_id
                    item['nick_name'] = nick_name
                    item['score'] = score
                    item['time'] = time
                    item['user_level'] = user_level
                    yield item
                    count += 1
                    if count >= 15:
                        temp_time = item['time']
                        current_t = datetime.datetime.strptime(temp_time, '%Y-%m-%d %H:%M:%S') + datetime.timedelta(
                            seconds=-1)
                        current_t = str(current_t)
                        if current_t > self.end_time:
                            url1 = 'http://m.maoyan.com/mmdb/comments/movie/248172.json?_v_=yes&offset=0&startTime=' + current_t.replace(
                                ' ', '%20')
                            yield Request(url1, headers=self.header, callback=self.parse)
                        else:
                            print('全部有关信息已经搜索完毕')
                except Exception as error:
                    print('提取信息出错1-----' + str(error))
            else:
                print('信息不全,已滤除')

　　pipelines文件

import pandas as pd
class MaoyanPipeline(object):
    def process_item(self, item, spider):
        dict_info = {'city': item['city'], 'content': item['content'], 'user_id': item['user_id'],
                     'nick_name': item['nick_name'],
                     'score': item['score'], 'time': item['time'], 'user_level': item['user_level']}
        try:
            data = pd.DataFrame(dict_info, index=[0])  # 为data创建一个表格形式 ,注意加index = [0]
            data.to_csv('G:\info.csv', header=False, index=True, mode='a',
                        encoding='utf_8_sig')  # 模式:追加,encoding = 'utf-8-sig'
        except Exception as error:
            print('写入文件出错-------->>>' + str(error))
        else:
            print(dict_info['content'] + '---------->>>已经写入文件')

　　最后爬完的数据12M左右，65000条数据左右

三.数据可视化

1.主要代码

用到的模块：pandas数据处理,matplotlib绘图，jieba分词，wordcloud词云，地图相关模块（echarts-countries-pypkg,echarts-china-provinces-pypkg, echarts-china-cities-pypkg）

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import pandas as pd
from collections import Counter
from pyecharts import Geo, Bar, Scatter
import jieba
import matplotlib.pyplot as plt
from wordcloud import WordCloud, STOPWORDS
import time

#观众地域图中部分注释
#attr:标签名称(地点)
#value:数值
#visual_range：可视化范围
#symbol_size:散点的大小
#visual_text_color:标签颜色
#is_visualmap:是否映射(数量与颜色深浅是否挂钩)
#maptype:地图类型

#读取csv文件(除了词云,其它图表用的源数据)
def read_csv(filename, titles):
    comments = pd.read_csv(filename, names = titles, low_memory = False)

    return comments

#词云用的源数据(比较小)
def read_csv1(filename1, titles):
    comments = pd.read_csv(filename1, names = titles, low_memory = False)

    return comments

#全国观众地域分布
def draw_map(comments):
    attr = comments['city_name'].fillna('zero_token') #以'zero_token'代替缺失数据
    data = Counter(attr).most_common(300) #Counter统计各个城市出现的次数,返回前300个出现频率较高的城市
    # print(data)
    data.remove(data[data.index([(i,x) for i,x in data if i == 'zero_token'][0])]) #检索城市'zero_token'并移除('zero_token', 578)
    geo =Geo('《复联4》全国观众地域分布', '数据来源:Mr.W', title_color = '#fff', title_pos = 'center', width = 1000, height = 600, background_color = '#404a59')
    attr, value = geo.cast(data) #data形式[('合肥',229),('大连',112)]
    geo.add('', attr, value, visual_range = [0, 4500], maptype = 'china', visual_text_color = '#fff', symbol_size = 10, is_visualmap = True)
    geo.render('G:\\影评\\观众地域分布-地理坐标图.html')
    print('全国观众地域分布已完成')


#观众地域排行榜单
def draw_bar(comments):
    data_top20 = Counter(comments['city_name']).most_common(20) #前二十名城市
    bar = Bar('《复联4》观众地域排行榜单', '数据来源:Mr.W', title_pos = 'center', width = 1200, height = 600)
    attr, value = bar.cast(data_top20)
    bar.add('', attr, value, is_visualmap = True, visual_range = [0, 4500], visual_text_color = '#fff', is_more_utils = True, is_label_show = True)
    bar.render('G:\\影评\\观众地域排行榜单-柱状图.html')
    print('观众地域排行榜单已完成')


#观众评论数量与日期的关系
#必须统一时间格式,不然时间排序还是乱的
def draw_data_bar(comments):
    time1 = comments['time']
    time_data = []
    for t in time1:
        if pd.isnull(t) == False and 'time' not in t: #如果元素不为空
            date1 = t.replace('/', '-')
            date2 = date1.split(' ')[0]
            current_time_tuple = time.strptime(date2, '%Y-%m-%d') #把时间字符串转化为时间类型
            date = time.strftime('%Y-%m-%d', current_time_tuple) #把时间类型数据转化为字符串类型
            time_data.append(date)
    data = Counter(time_data).most_common() #data形式[('2019/2/10', 44094), ('2019/2/9', 43680)]
    data = sorted(data, key = lambda data : data[0]) #data1变量相当于('2019/2/10', 44094)各个元组 itemgetter(0)
    bar =Bar('《复联4》观众评论数量与日期的关系', '数据来源:Mr.W', title_pos = 'center', width = 1200, height = 600)
    attr, value = bar.cast(data) #['2019/2/10', '2019/2/11', '2019/2/12'][44094, 38238, 32805]
    bar.add('', attr, value, is_visualmap = True, visual_range = [0, 3500], visual_text_color = '#fff', is_more_utils = True, is_label_show = True)
    bar.render('G:\\影评\\观众评论日期-柱状图.html')
    print('观众评论数量与日期的关系已完成')


#观众评论数量与时间的关系
#这里data中每个元组的第一个元素要转化为整数型,不然排序还是乱的
def draw_time_bar(comments):
    time = comments['time']
    time_data = []
    real_data = []
    for t in time:
        if pd.isnull(t) == False and ':' in t:
            time = t.split(' ')[1]
            hour = time.split(':')[0]
            time_data.append(hour)
    data = Counter(time_data).most_common()
    for item in data:
        temp1 = list(item)
        temp2 = int(temp1[0])
        temp3 = (temp2,temp1[1])
        real_data.append(temp3)
    data = sorted(real_data, key = lambda x : x[0])
    bar = Bar('《复联4》观众评论数量与时间的关系', '数据来源:Mr.W', title_pos = 'center', width = 1200, height = 600)
    attr, value = bar.cast(data)
    bar.add('', attr, value, is_visualmap = True, visual_range = [0, 3500], visual_text_color = '#fff', is_more_utils = True, is_label_show = True)
    bar.render('G:\\影评\\观众评论时间-柱状图.html')
    print('观众评论数量与时间的关系已完成')


#词云,用一部分数据生成,不然数据量有些大,会报错MemoryError(64bit的python版本不会)
def draw_word_cloud(comments):
    data = comments['comment']
    comment_data = []
    print('由于数据量比较大,分词这里有些慢,请耐心等待')
    for item in data:
        if pd.isnull(item) == False:
            comment_data.append(item)
    comment_after_split = jieba.cut(str(comment_data), cut_all = False)
    words = ' '.join(comment_after_split)
    stopwords = STOPWORDS.copy()
    stopwords.update({'电影', '非常', '这个', '那个', '因为', '没有', '所以', '如果', '演员', '这么', '那么', '最后', '就是', '不过', '这个', '一个', '感觉', '这部', '虽然', '不是', '真的', '觉得', '还是', '但是'})
    wc = WordCloud(width = 800, height = 600, background_color = '#000000', font_path = 'simfang', scale = 5, stopwords = stopwords, max_font_size = 200)
    wc.generate_from_text(words)
    plt.imshow(wc)
    plt.axis('off')
    plt.savefig('G:\\影评\\WordCloud.png')
    plt.show()

#观众评分排行榜单
def draw_score_bar(comments):
    score_list = []
    data_score = Counter(comments['score']).most_common()
    for item in data_score:
        if item[0] != 'score':
            score_list.append(item)
    data = sorted(score_list, key = lambda x : x[0])
    bar = Bar('《复联4》观众评分排行榜单', '数据来源:Mr.W', title_pos = 'center', width = 1200, height = 600)
    attr, value = bar.cast(data)
    bar.add('', attr, value, is_visualmap = True, visual_range = [0, 4500], visual_text_color = '#fff', is_more_utils = True, is_label_show = True)
    bar.render('G:\\影评\\观众评分排行榜单-柱状图.html')
    print('观众评分排行榜单已完成')


#观众用户等级排行榜单
def draw_user_level_bar(comments):
    level_list = []
    data_level = Counter(comments['user_level']).most_common()
    for item in data_level:
        if item[0] != 'user_level':
            level_list.append(item)
    data = sorted(level_list, key = lambda x : x[0])
    bar = Bar('《复联4》观众用户等级排行榜单', '数据来源:Mr.W', title_pos = 'center', width = 1200, height = 600)
    attr, value = bar.cast(data)
    # is_more_utils = True 提供更多的实用工具按钮
    bar.add('', attr, value, is_visualmap = True, visual_range = [0, 4500], visual_text_color = '#fff', is_more_utils = True, is_label_show = True)
    bar.render('G:\\影评\\观众用户等级排行榜单-柱状图.html')
    print('观众用户等级排行榜单已完成')


if __name__ == '__main__':
    filename = 'G:\\info.csv'
    filename2 = 'G:\\info.csv'
    titles = ['city_name','comment','user_id','nick_name','score','time','user_level']
    comments = read_csv(filename, titles)
    comments2 = read_csv1(filename2, titles)
    draw_map(comments)
    draw_bar(comments)
    draw_data_bar(comments)
    draw_time_bar(comments)
    draw_word_cloud(comments2)
    draw_score_bar(comments)
    draw_user_level_bar(comments)

　

　2.效果与分析

01.观众地域分布-地理坐标图

由全国地域热力图可见，观众主要分布在中部，南部，东部以及东北部，各省会城市的观众尤其多(红色代表观众最多)，这与实际的经济、文化、消费水平基本相符.（ps：复联4的票价有点贵）

02.《复联4》观众地域排行榜单

北上广深等一线城市，观众粉丝多，消费水平可以。观影数量非常多。

03.《复联4》观众评分排行榜单

可以看到评分满分的用户几乎超过总人数的70%，可见观众看完电影之后很满足，也说明了电影的可看性很高

04.《复联4》观众评论数量与日期的关系

24号上映到现在已经三天，其中观影人数最多的是25号，可能大家觉得首映有点小贵吧，哈哈。

05.《复联4》观众评论数量与时间的关系

从图中可以看出，评论的数量主要集中在16-23点，因为这部电影时长为2小时，所以把评论时间往前移动2小时基本就是看电影时间。可以看出大家都是中午吃完饭(13点左右)和晚上吃完饭(19点左右)后再去看电影的，而且晚上看电影的人更多

06.《复联4》观众用户等级排行榜单

可见用户等级为0，5，6的用户基本没有，而且随着等级的提升，人数急剧变少。新用户可能是以年轻人为主，对科幻电影感兴趣，因而评论数量较多，而老用户主要偏向于现实剧情类的电影，评论数量较少

07.《复联4》词云图

在词云图中可以看到，“好看，可以，完美，精彩，情怀”等字眼，看来影片还是挺好看的。接着就是“钢铁侠，美队，灭霸”看来这几个人在影评中有重要的故事线。