#pip install virtualenv
2虛環境的使用
#cd [項目所在目錄]
#virtualenv venv
#./venv/bin/pip install [xxx]
//測試#source ./venv/bin/activate
//進入虛環境#deactivate
//退出#pip install virtualenv
#cd [項目所在目錄]
#virtualenv venv
#./venv/bin/pip install [xxx]
//測試#source ./venv/bin/activate
//進入虛環境#deactivate
//退出class MetaCls(type): def __new__(cls, *args, **kwargs): print("in MetaCls") # return super(Meta