# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo


# yum -y install yum-utils

# yum install wget -y 

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo 

# yum install -y git

# yum install -y gcc make patch gdbm-devel openssl-devel sqlite-devel readline-devel zlib-devel bzip2-devel

# useradd python

# echo 132456|passwd --stdin python

# su - python

$  curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer|bash

$ vim .bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/.local/bin:$HOME/bin

export PATH
export PATH="/home/python/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"


$ . .bash_profile

$ python -V
Python 2.7.5

$ pyenv 
pyenv 1.2.20
Usage: pyenv <command> [<args>]

Some useful pyenv commands are:
   activate    Activate virtual environment
   commands    List all available pyenv commands
   deactivate   Deactivate virtual environment
   doctor      Verify pyenv installation and development tools to build pythons.
   exec        Run an executable with the selected Python version
   global      Set or show the global Python version(s)
   help        Display help for a command
   hooks       List hook scripts for a given pyenv command
   init        Configure the shell environment for pyenv
   install     Install a Python version using python-build
   local       Set or show the local application-specific Python version(s)
   prefix      Display prefix for a Python version
   rehash      Rehash pyenv shims (run this after installing executables)
   root        Display the root directory where versions and shims are kept
   shell       Set or show the shell-specific Python version
   shims       List existing pyenv shims
   uninstall   Uninstall a specific Python version
   version     Show the current Python version(s) and its origin
   --version   Display the version of pyenv
   version-file   Detect the file that sets the current pyenv version
   version-name   Show the current Python version
   version-origin   Explain how the current Python version is set
   versions    List all Python versions available to pyenv
   virtualenv   Create a Python virtualenv using the pyenv-virtualenv plugin
   virtualenv-delete   Uninstall a specific Python virtualenv
   virtualenv-init   Configure the shell environment for pyenv-virtualenv
   virtualenv-prefix   Display real_prefix for a Python virtualenv version
   virtualenvs   List all Python virtualenvs found in `$PYENV_ROOT/versions/*‘.
   whence      List all Python versions that contain the given executable
   which       Display the full path to an executable

$ pyenv install 3.5.3 -v
/tmp/python-build.20200718063111.6245 ~
Downloading Python-3.5.3.tar.xz...
-> https://www.python.org/ftp/python/3.5.3/Python-3.5.3.tar.xz

$ ls -a
.  ..  .bash_history  .bash_logout  .bash_profile  .bashrc  .pki  .pyenv  .viminfo

$ mkdir .pyenv/cache

将下载好的包放入cache目录，然后执行安装命令

$ pyenv install 3.6.4 -v
/tmp/python-build.20200718070338.7001 ~/.pyenv
/tmp/python-build.20200718070338.7001/Python-3.6.4 /tmp/python-build.20200718070338.7001 ~/.pyenv
Installing Python-3.6.4...
checking build system type... x86_64-pc-linux-gnu

[python@localhost .pyenv]$ pyenv version
system (set by /home/python/.pyenv/version)

[python@localhost .pyenv]$ python -V
Python 2.7.5

$ pyenv version
3.6.4 (set by /home/python/.pyenv/version)

$ python -V
Python 2.7.5

[python@localhost ~]$ pyenv versions
  system
* 3.6.4 (set by /home/python/.pyenv/version)

[python@localhost ~]$ python -V
Python 3.6.4

[python@localhost ~]$ pyenv global system

[python@localhost ~]$ pyenv versions
* system (set by /home/python/.pyenv/version)
  3.6.4

[python@localhost .pyenv]$ pyenv shell 3.6.4

[python@localhost .pyenv]$ pyenv versions
  system
* 3.6.4 (set by PYENV_VERSION environment variable)

[python@localhost .pyenv]$ python -V
Python 2.7.5

[python@localhost ~]$ pyenv versions
* system (set by /home/python/.pyenv/version)
  3.6.4

[python@localhost ~]$ python -V
Python 2.7.5

[python@localhost .pyenv]$ cd
[python@localhost ~]$ mkdir zh/projects -p
[python@localhost ~]$ cd zh/projects/

[python@localhost ~]$ cd zh/projects/

[python@localhost projects]$ pyenv local 3.6.4

[python@localhost projects]$ pyenv versions
  system
* 3.6.4 (set by /home/python/zh/projects/.python-version)

[python@localhost projects]$ python -V
Python 3.6.4

[python@localhost cmdb]$ cd

[python@localhost ~]$ pyenv versions
* system (set by /home/python/.pyenv/version)
  3.6.4

[python@localhost ~]$ python -V
Python 2.7.5

[python@localhost projects]$ mkdir cmdb

[python@localhost projects]$ cd zh/projects/cmdb

[python@localhost cmdb]$ pyenv versions
  system
* 3.6.4 (set by /home/python/zh/projects/.python-version)

[python@localhost cmdb]$ python -V
Python 3.6.4

[python@localhost ~]$ cd .pyenv/cache/

[python@localhost cache]$ ll
total 31456
-rw-r--r--. 1 python python 15213396 Dec  7  2018 Python-3.5.3.tar.xz
-rw-r--r--. 1 python python 16992824 Nov 17  2018 Python-3.6.4.tar.xz

[python@localhost projects]$ pyenv install 3.5.3 -v

[python@localhost ~]$ ll .pyenv/versions
total 0
drwxr-xr-x. 6 python python 56 Jul 18 08:39 3.5.3
drwxr-xr-x. 6 python python 56 Jul 18 07:34 3.6.4

[python@localhost cmdb]$ pyenv virtualenv 3.5.3 zh353
Requirement already satisfied: setuptools in /home/python/.pyenv/versions/3.5.3/envs/zh353/lib/python3.5/site-packages
Requirement already satisfied: pip in /home/python/.pyenv/versions/3.5.3/envs/zh353/lib/python3.5/site-packages

[python@localhost cmdb]$ pyenv versions
  system
  3.5.3
  3.5.3/envs/zh353
* 3.6.4 (set by /home/python/zh/projects/.python-version)
  zh353

[python@localhost cmdb]$ pyenv local zh353 

(zh353) [python@localhost cmdb]$ pyenv versions
  system
  3.5.3
  3.5.3/envs/zh353
  3.6.4
* zh353 (set by /home/python/zh/projects/cmdb/.python-version)

(zh353) [python@localhost cmdb]$ mkdir ../web
(zh353) [python@localhost cmdb]$ cd ../web

[python@localhost web]$ pyenv local 3.6.4
[python@localhost web]$ pyenv versions
  system
  3.5.3
  3.5.3/envs/zh353
* 3.6.4 (set by /home/python/zh/projects/web/.python-version)
  zh353