新冠疫情来临，我简单的做一次疫情的数据分析温习我的python知识，也希望能帮到各位。分析中我用到的技术有：pyton爬取数据html+css将分析结果排版。用到的工具有excel+tableau进行数据处理分析和绘图。数据分析中还是存在很多的不足，很多地方有待提高，希望大家多多交流。
首先，我们要获取到数据，本次数据分析所需要的疫情数据来自https://ncov.dxy.cn。通过对网站的分析有世界的疫情数据和中国的疫情数据，所以我们要分别爬取到世界和全国的疫情数据。

好了，接下来废话不多说，为了更直观的了解数据爬取的过程，我把爬取世界疫情数据、爬取全国的疫情数据分开来写，虽然有很多相同的代码，不过能更好的理解数据获取的过程。
爬取世界疫情数据的代码：

import json
import requests
import pandas as pd
from bs4 import BeautifulSoup
url = 'https://ncov.dxy.cn/ncovh5/view/pneumonia?from=timeline&isappinstalled=0'
headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36'}
response = requests.get(url,headers = headers)
response.encoding = 'utf-8'
content = response.content.decode('utf-8')#以字节流形式打印网页源码
soup = BeautifulSoup(response.text,'lxml')
#爬取选择网页文档的内容
data = soup.find_all(name = 'script',attrs = {'id':'getListByCountryTypeService2true'})
#转为字符串
account = str(data)
account1 = account[95:-21]#切片截取从52到后面倒数21取到需要的数据
account1_json = json.loads(account1)#提取数据到列表
id = []
continents = []
provinceName = []
currentConfirmedCount = []
confirmedCount = []
confirmedCountRank = []
suspectedCount = []
curedCount = []
deadCount = []
deadCountRank = []
deadRate = []
deadRateRank = []
print(len(account1_json))
i=0
for a in account1_json:if 'id' in a:id.append(a['id'])else:id.append('没有')continents.append(a['continents'])provinceName.append(a['provinceName'])currentConfirmedCount.append(a['currentConfirmedCount'])confirmedCount.append(a['confirmedCount'])if 'confirmedCountRank' in a:confirmedCountRank.append(a['confirmedCountRank'])else:confirmedCountRank.append('没有')suspectedCount.append(a['suspectedCount'])curedCount.append(a['curedCount'])deadCount.append(a['deadCount'])if 'deadCountRank' in a:deadCountRank.append(a['deadCountRank'])else:deadCountRank.append('没有')if 'deadRate' in a:deadRate.append(a['deadRate'])else:deadRate.append('没有')if 'deadRateRank' in a:deadRateRank.append(a['deadRateRank'])else:deadRateRank.append('没有')#转换成pandas数组
df = {'id':pd.Series(id),'所在大洲':pd.Series(continents),'城市':pd.Series(provinceName),'当前确诊':pd.Series(currentConfirmedCount),'累计确诊':pd.Series(confirmedCount),'确诊排名':pd.Series(confirmedCountRank),'疑似病例':pd.Series(suspectedCount),'治愈人数':pd.Series(curedCount),'死亡人数':pd.Series(deadCount),'死亡人数排名':pd.Series(deadCountRank),'死亡率':pd.Series(deadRate),'死亡率排名':pd.Series(deadRateRank)
}
pds = pd.DataFrame(df)
pds.to_excel('1.xlsx', index=False)

以上代码我将数据爬取后用pandas处理过后并写到表格文件里：

国内疫情数据的爬取：

import requests
import pandas as pd
from bs4 import BeautifulSoup
import re
url = 'https://ncov.dxy.cn/ncovh5/view/pneumonia?from=timeline&isappinstalled=0'
headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36'}
#省级正则表达式
provinceName_re = re.compile(r'"provinceName":"(.*?)",')
provinceShortName_re = re.compile(r'"provinceShortName":"(.*?)",')
currentConfirmedCount_re = re.compile(r'"currentConfirmedCount":(.*?),')
confirmedCount_re = re.compile(r'"confirmedCount":(.*?),')
suspectedCount_re = re.compile(r'"suspectedCount":(.*?),')
curedCount_re = re.compile(r'"curedCount":(.*?),')
deadCount_re = re.compile(r'"deadCount":(.*?),')
comment_re = re.compile(r'"comment":"(.*?)",')
locationId_re = re.compile(r'"locationId":(.*?),')
statisticsData_re = re.compile(r'"statisticsData":"(.*?)",')
cities_re = re.compile(r'"cities":\[\{(.*?)\}\]')#市级正则表达式
cityName_re = re.compile(r'"cityName":"(.*?)",')
currentConfirmedCount_1_re = re.compile(r'"currentConfirmedCount":(.*?),')
confirmedCount_1_re = re.compile(r'"confirmedCount":(.*?),')
suspectedCount_1_re = re.compile(r'"suspectedCount":(.*?),')
curedCount_1_re = re.compile(r'"curedCount":(.*?),')
deadCount_1_re = re.compile(r'"deadCount":(.*?),')
locationId_1_re = re.compile(r'"locationId":(.*?)\},')#爬虫爬取数据
datas = requests.get(url,headers = headers)
datas.encoding = 'utf-8'
soup = BeautifulSoup(datas.text,'lxml')
data = soup.find_all('script',{'id':'getAreaStat'})
data = str(data)
data_str = data[54:-23]#替换字符串内容，避免重复查找
citiess = re.sub(cities_re,'8888',data_str)
#查找省级数据
provinceNames = re.findall(provinceName_re,citiess)
provinceShortNames = re.findall(provinceShortName_re,citiess)
currentConfirmedCounts = re.findall(currentConfirmedCount_re,citiess)
confirmedCounts = re.findall(confirmedCount_re,citiess)
suspectedCounts = re.findall(suspectedCount_re,citiess)
curedCounts = re.findall(curedCount_re,citiess)
deadCounts = re.findall(deadCount_re,citiess)
comments = re.findall(comment_re,citiess)
locationIds = re.findall(locationId_re,citiess)
statisticsDatas = re.findall(statisticsData_re,citiess)#查找市级数据
citiess_str1 = re.findall(cities_re,data_str)
#将市级列表数据转为字符串，方便正则表达式查找
citiess_str = str(citiess_str1)
cityName = re.findall(cityName_re,citiess_str)
currentConfirmedCount_1 = re.findall(currentConfirmedCount_1_re,citiess_str)
confirmedCount_1 = re.findall(confirmedCount_1_re,citiess_str)
suspectedCount_1 = re.findall(suspectedCount_1_re,citiess_str)
curedCount_1 = re.findall(curedCount_1_re,citiess_str)
deadCount_1 = re.findall(deadCount_1_re,citiess_str)# 省级数据转换为pandas数组
df = {'地区代码':pd.Series(locationIds),'省':pd.Series(provinceNames),'省区短名':pd.Series(provinceShortNames),'当前确诊':pd.Series(currentConfirmedCounts),'累计确诊':pd.Series(confirmedCounts),'疑似确诊':pd.Series(suspectedCounts),'治愈人数':pd.Series(curedCounts),'死亡人数':pd.Series(deadCounts),'评论':pd.Series(comments),'统计数据区':pd.Series(statisticsDatas),
}
pds = pd.DataFrame(df)
pds.to_excel('国内疫情统计表1.xlsx',index=True)

获取数据后用Excel进行简单的处理，并和tableau一起将结果绘制成图像。下图是几张成果图：
世界疫情热点地图：

国内疫情热点地图：

将获取处理过的数据可视化以后还差形成报告分析的形式，编写报告的方式很多，不过我选择的是用前端网页的形式呈现出来。这种的方法的优点是：排版的效果更好，更直观，可以自己通过编写代码的形式自己设计想要的排版格式；缺陷是不可打印，难度较大，需要对html和css有一定的基础。数据可在我的个人博客获取，数据的链接如下见路不走个人博客
也有网友给我说能不能获取到历史的的数据，我下载仔细研究了一下，每个省每天都会公布当天的疫情数据，所以只有去爬取每个省每天的公布信息，然后对其挖掘处理便可得到对应省份的历史信息，我重新用java和springboot框架编写爬虫并已经获取了各个省份全部的新冠历史疫情数据，具体的看我的另一篇博文：全国各省新冠肺炎疫情的历史数据