解决：安装 django-celery-beat 自动把 django 升级到 3.0 了

Django-1.11.26: Successfully uninstalled Django-1.11.26 Successfully installed asgiref-3.2.3 django 1.11.26 安装日志提示版本有兼容性问题，目前暂未发现使用影响 (joyoo) E:\yinzhuoqun\djangos\joyoo>pip uninstall django Uninstalling Django y Successfully uninstalled Django-3.0 (joyoo) E:\yinzhuoqun\djangos\joyoo>pip install django==1.11.26