$ django-admin
zsh: command not found: django-admin
解决办法
python3 /Users/xxxxx/Library/Python/3.8/lib/python/site-packages/django/bin/django-admin.py startproject mysite
$ django-admin
zsh: command not found: django-admin
解决办法
python3 /Users/xxxxx/Library/Python/3.8/lib/python/site-packages/django/bin/django-admin.py startproject mysite