由于阿里云镜像自带的源更新比较缓慢，最新的python3版本还是3.5，而我的代码使用的库需要python3.6+，因此需要先更新debian源：
vim /etc/apt/sources.list在其中添加：
deb http://mirrors.163.com/debian/ testing main执行：
apt-get update
apt-get install python3.6 python3.6-dev python3.6-distutils
apt-get install python-pip安装wsgi：
sudo apt-get install libapache2-mod-wsgi-py3在/etc/apache2/sites-available中新建flask.conf文件，在其中输入：
WSGIPythonPath /var/www/html/flask
<VirtualHost *:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
ServerName flask.yunwei123.tech
# ServerAdmin webmaster@localhost
DocumentRoot /var/www/html/flask
# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
WSGIScriptAlias / /var/www/html/flask/app.wsgi
<Directory /var/www/html/flask>
Require all granted
<Files app.wsgi>
Allow from all
</Files>
</Directory>
# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet保存。
在网站根目录（这里是）新建app.wsgi文件，输入：
from server import app as application再在同一个目录下新建server.py, 输入：
from flask import Flask
import platform
print(platform.python_version())
app = Flask(__name__)
@app.route('/')
def hello_world():
return platform.python_version()
if __name__ == '__main__':
app.run(host='0.0.0.0')打开网页就可以看到啦。
这里搭建的网页：
使用 flask + pyechart 搭建的简单新冠肺炎疫情数据可视化交互分析平台，包含疫情数据获取、态势感知、预测分析、舆情监测等任务：http://flask.yunwei123.tech/进行查看
包含完整代码和实现的github地址：
https://github.com/yunwei37/COVID-19-NLP-vis
