ubuntu虚拟环境和切换pyhton解释器版本

https://www.jianshu.com/p/51140800e8b4

ubuntu16.04中将python3设置为默认

转自https://www.cnblogs.com/Jeb15/p/6080331.html

直接执行这两个命令即可:

/usr/bin/python2 100 sudo update-alternatives --install
/usr/bin/python python /usr/bin/python3 150 ```

安装依赖包(须在虚拟环境中)

pip freeze > requirements.txt

pip install -r requirements.txt

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转载自blog.csdn.net/b806071099/article/details/86233995