強制 Gunicorn 使用 Python 3

$ vi run_gunicorn.py

#-*- coding: utf-8 -*-
import re
import sys
from gunicorn.app.wsgiapp import run
if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$','',sys.argv[0])
    sys.exit(run())

$ python3 run_gunicorn.py -w 4 -b 0.0.0.0:5000 main:app

References :

Linux下配置Python3+Flask+Gunicorn