 FLASK설치 https://www.youtube.com/watch?v=zcYMB-uXKNs&t=33s <br />
특히 connection error時, jk.jpg, 2021.05.25.<br />
 flask python start pi4,  cd /var/www/piApp , <br />
1.sudo nano hello.py , <br />
2.export FLASK_APP=hello.py , <br />
3.flask run --host=0.0.0.0 참고 app.run(host="0.0.0.0".port=80) <br />
pi.화일 위치 /var/www/piApp/hello.py, /home/pi/Templates/test.html <br />
mariadb phpmyadmin 설치 pi4 ---https://www.youtube.com/watch?v=LiB_rpzmiFc&t=225s <br />
FLASK초보자공부최고-- https://wikidocs.net/81238