[python@localhost ~]$ pyenv install -l //查看可用的安装版本
[python@localhost ~]$ pyenv install 3.6.9 //在线安装python3.6.9版本
[python@localhost ~]$ pyenv virtualenv 3.6.9 py3 //创建虚拟环境，3.6.9为python版本，py3为别名
[python@localhost test]$ pyenv local 3.6.9 //进入目录，设置或显示本地python版本(本目录有效)
[python@localhost test]$ pyenv global system //设置或显示全局python版本
[python@localhost test]$ pyenv version //显示当前python版本
[python@localhost test]$ pyenv versions //显示可用的所有python版本
[python@localhost test]$ pyenv update //更新pyenv
[python@localhost ~]$ pyenv virtualenvs //查看所有虚拟环境
[python@localhost ~]$ rm -fr ~/.pyenv //卸载pyenv
[python@localhost ~]$ pyenv virtualenv-delete py3 //删除虚拟环境

[root@localhost ~]$ useradd python
[root@localhost ~]$ su - python
[python@localhost ~]$ echo python | passwd python --stdin

[python@localhost ~]$ yum install gcc make patch gdbm-devel openssl-devel sqlite-devel readline-devel
zlib-devel bzip2-devel git curl

#方法1：在线安装
[python@localhost ~]$ curl -L https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer | bash

#方法2：为避免受制墙限制而无法在线安装，复制如下链接的shell脚本到本地pyenv.sh：
https://github.com/pyenv/pyenv-installer/blob/master/bin/pyenv-installer

[python@localhost ~]$ touch pyenv.sh //新建文件，把上面的shell代码贴进来，保存
[python@localhost ~]$ bash pyenv.sh

[python@localhost ~]$ vim .bashrc 

#最下面，新增如下脚本
export PATH="/home/python/.pyenv/bin:$PATH" 
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

[python@localhost ~]$ exec $SHELL

#在.pyenv目录下创建cache目录，已通过winSCP上传好
[python@localhost ~]$ cd .pyenv
[python@localhost .pyenv]$ mkdir cache
[python@localhost cache]$ ll
总用量 34224
-rw-rw-r--. 1 python python 17212164 12月 15 01:56 Python-3.6.9.tar.xz
-rw-rw-r--. 1 python python 17829824 12月 15 01:57 Python-3.8.0.tar.xz

[python@localhost pkg]$ pyenv install 3.6.9 -vvv //-v 可以看到安装详细的过程
[python@localhost ~]$ pyenv install 3.8.0 -vvv //-v 可以看到安装详细的过程

#举个栗子:
 #1.Python目录，使用python3.6.9版本
 #2.My_django目录，使用python3.6.9版本
 #3.test目录，使用python3.8.0版本

[python@localhost Python]$ mkdir -pv network/Python/
[python@localhost Python]$ mkdir -pv network/My_django/
[python@localhost Python]$ mkdir -pv network/test/

#Python目录：
[python@localhost ~]$ pyenv virtualenv 3.6.9 py3 //设置别名py3
[python@localhost Python]$ pyenv local py3
(py3) [python@localhost Python]$ pyenv version
py3 (set by /home/python/network/Python/.python-version)
(py3) [python@localhost Python]$  //左边看到(py3)说明已在虚拟环境中，是独立的

#My_django目录：
[python@localhost ~]$ pyenv virtualenv 3.6.9 py369 //设置别名py369
[python@localhost My_django]$ pyenv local py369
(py369) [python@localhost My_django]$ pyenv version
py369 (set by /home/python/network/My_django/.python-version)
(py369) [python@localhost My_django]$

#test目录：
[python@localhost ~]$ pyenv virtualenv 3.8.0 py380 //设置别名py380
[python@localhost test]$ pyenv local py380
(py380) [python@localhost test]$ pyenv version
py380 (set by /home/python/network/test/.python-version)
(py380) [python@localhost test]$

#验证效果
 #在My_django虚拟环境下安装pip install redis
 #其他虚拟目录没有redis
#My_django虚拟环境
(py369) [python@localhost My_django]$ pip list
Package  Version
---------- -------
pip    19.3.1 
redis   3.3.11 
setuptools 40.6.2
#Python虚拟环境
[python@localhost Python]$ pip list
Package  Version
---------- -------
pip    19.2.3 
setuptools 41.2.0