ubuntu 安装 Python3.6 创建 虚拟环境

1、更新包列表

sudo apt-get update

2、更新已安装的包

sudo apt-get upgrade

3、安装python3.6

sudo apt-get install python3.6

4、自动删除不需要软件

sudo apt autoremove

5、删除原来python依赖

sudo rm /usr/bin/python3 

6、更换默认python3 的版本为3.6

sudo ln -s /usr/bin/python3.6 /usr/bin/python3

6.1 pip 安装包报错 /bin/pip: No such file or directory 问题 (1)、which pip

/usr/local/bin/pip

(2)、 pip

-su: /usr/bin/pip: No such file or directory

(3)、type pip

pip is hashed (/usr/bin/pip) So pip is definintely in /usr/local/bin/pip but it is been cached as in /usr/bin/pip, thanks to the Stackoverflow question, the solution is very simple:

(4)、解决办法

hash -r

7、安装python虚拟环境模块virtualenv

pip3 install virtualenv
source env/bin/activate

8、查看python3和pip3版本

python3 -V | python -V pip3 -V | pip -V