一、B站弹幕分析

B站弹幕数据存放在https://comment.bilibili.com/cid.xml中，其中cid是视频的cid号，获取需要爬取的视频的cid号的方法如下：

二、页面源代码

# -!- coding: utf-8 -!-
import requests
import re
import pandas as pd
import string
import jieba


def get_data(cid):
    # 分析网页，并获取网页文件
    url = 'https://comment.bilibili.com/{}.xml'.format(cid)
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0;Win64;x64) AppleWebKit/537.36(KHTML, likeGecko) Chrome/80.0.3987.163Safari/537.36"
    }
    response = requests.get(url,headers = headers).content.decode('utf-8')
    return response
def parse_html(response):
    # 解读网页文件，获取关键信息
    # soup = bs4.BeautifulSoup(response)
    # lst = [soup.find_all(name='d')]
    # danmuku = [i.text for i in lst]

    pattern = re.compile(r'<d p=".*?">(.*?)</d>')
    danmuku = re.findall(pattern,response)
    return danmuku
def save_data(danmuku,cid):
    # 保存数据
    Dict = {
        'danmuku' : danmuku
    }
    pd_data = pd.DataFrame(Dict)
    cid = str(cid)
    name = cid + '弹幕文件.csv'
    path = 'D:\PyCharm\Program\pachong\Day03\弹幕数据\{}'.format(name)
    pd_data.to_csv(path,index = False,header=False,mode='w',encoding='utf-8-sig')

def data_preprocess(danmuku,cid):
    cid = str(cid)
    name = cid + '弹幕文件.csv'
    path = 'D:\PyCharm\Program\pachong\Day03\弹幕数据\{}'.format(name)
    with open(path ,mode='r',encoding='utf-8') as f:
        # 加载用户自定义字典
        jieba.load_userdict (r'D:\PyCharm\Program\pachong\Day03\userdict')
        reader = f.read().replace('\n','')
        # 加载停用词词表
        stopwords = [line.strip() for line in open(r'D:\PyCharm\Program\pachong\Day03\stop_wordslst',encoding ='gbk').readlines()]
        # 去标点，去数字，去空白
        pun_num = string.punctuation + string.digits
        table = str.maketrans('','',pun_num)
        reader = reader.translate(table)
        seg_list = jieba.cut(reader,cut_all=False)
        sentence = ''
        for word in seg_list:
            if word not in stopwords and word.isspace() == False:
                sentence += word
                sentence += ','
        sentence = sentence[:-1]
        return sentence

def count_words(txt,cid):
    cid = str(cid)
    name = cid + '弹幕词汇数统计.csv'
    path = 'D:\PyCharm\Program\pachong\Day03\弹幕数据\{}'.format(name)
    aDict = {}
    words = txt.split(',')
    for word in words:
        aDict[word] = aDict.get(word,0) + 1
    pd_count = pd.DataFrame(aDict,index=['times']).T.sort_values('times',ascending=False)
    pd_count.to_csv(path)

if __name__ == "__main__":

    cid = int(input('请输入你想查询的视频CID号：'))
    response = get_data(cid)
    danmuku = parse_html(response)
    save_data(danmuku,cid)
    sentence = data_preprocess(danmuku,cid)
    count_words(sentence,cid)

三、运行结果

1、控制台输入视频cid号，进行爬取。

2、爬取数据存储路径

3、弹幕数据

4、弹幕词汇统计