Install pyenv,

Install pyenv,

Install pyenv

Bytes

Install the dependent environment (root User ):

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

Install pyenv (Common User ):

$ git clone https://github.com/pyenv/pyenv.git ~/.pyenv$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile$ echo 'eval "$(pyenv init -)"' >> ~/.bash_profile$ exec "$SHELL"

View supported python versions:

$ pyenv install --list

Install a specific version:

[ocean@jenkins ~]$ pyenv install 3.6.2Downloading Python-3.6.2.tar.xz...-> https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xzInstalling Python-3.6.2...Installed Python-3.6.2 to /home/ocean/.pyenv/versions/3.6.2

[root@jenkins ~]# pyenv install 3.5.2pyenv: /root/.pyenv/versions/3.5.2 already existscontinue with installation? (y/N) yDownloading Python-3.5.2.tar.xz...-> https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xzInstalling Python-3.5.2...patching file Lib/venv/scripts/posix/activate.fishInstalled Python-3.5.2 to /root/.pyenv/versions/3.5.2

 

View the installed python version:

[ocean@jenkins py362]$ pyenv versions* system (set by /home/ocean/py362/.python-version)  3.5.2  3.6.2

 

 

OK. For simple use, you can view the help information:

[ocean@jenkins ~]$ pyenv helpUsage: pyenv <command> [<args>]Some useful pyenv commands are:   commands    List all available pyenv commands   local       Set or show the local application-specific Python version   global      Set or show the global Python version   shell       Set or show the shell-specific Python version   install     Install a Python version using python-build   uninstall   Uninstall a specific Python version   rehash      Rehash pyenv shims (run this after installing executables)   version     Show the current Python version and its origin   versions    List all Python versions available to pyenv   which       Display the full path to an executable   whence      List all Python versions that contain the given executableSee `pyenv help <command>' for information on a specific command.For full documentation, see: https://github.com/pyenv/pyenv#readme

How can I switch the python version?

Use the local command of pyenv:

[ocean@jenkins ~]$ tree .├── py352└── py3622 directories, 0 files

 

In the home directory, I created the corresponding directories according to the installed python version number. Let's test:

[ocean@jenkins ~]$ cd py352/[ocean@jenkins py352]$ python -VPython 2.7.5

 

If the local command of pyenv is not executed, the python version is the default version 2.7.5 of the system. Then we can use pyenv to switch the version:

[ocean@jenkins py352]$ pyenv local 3.5.2[ocean@jenkins py352]$ python -VPython 3.5.2

 

Directly becomes 3.5.2, and then we are returning to the pycharm Directory :,

[ocean@jenkins py352]$ cd ../py362[ocean@jenkins py362]$ python -VPython 2.7.5[ocean@jenkins py362]$ pyenv local 3.6.2[ocean@jenkins py362]$ python -VPython 3.6.2

 

Go back to the home directory and check the following:

[ocean@jenkins py362]$ cd [ocean@jenkins ~]$ python -VPython 2.7.5

 

Or the default python version.

[ocean@jenkins py362]$ ll /home/ocean/py362 -atotal 8drwxrwxr-x 2 ocean ocean   28 Sep  4 19:08 .drwx------ 6 ocean ocean 4096 Sep  4 19:08 ..-rw-rw-r-- 1 ocean ocean    6 Sep  4 19:04 .python-version[ocean@jenkins py362]$ cat .python-version 3.6.2

 

Pyenv is

.python-version

File to switch to a specific version of python. If you delete this file, the system returns to the default python program.

If you want to use the default python program in a specific python version directory, you can run the following command in a specific directory:

$ pyenv local system

In this way, you can switch between multiple versions of python.