python 使用 pyenv 多环境切换

利用pyenv 实现python 多版本切换
下载

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

安装支持包

yum install  zlib-devel openssl-devel sqlite-devel patch

增加配置：.bash_profile

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

安装3.6.1

pyenv install 3.6.1

安装2.7

pyenv  install  2.7

如果系统最小化安装缺少，patch命令

Downloading Python-2.7.tgz...
-> https://www.python.org/ftp/python/2.7/Python-2.7.tgz Installing Python-2.7...
/root/.pyenv/plugins/python-build/bin/python-build: line 1501: patch: command not found
BUILD FAILED (CentOS release 6.5 (Final) using python-build 20160602)
Inspect or clean up the working tree at /tmp/python-build.20170612214128.21462
Results logged to /tmp/python-build.20170612214128.21462.log
Last 10 log lines:
/tmp/python-build.20170612214128.21462 ~
/tmp/python-build.20170612214128.21462/Python-2.7 /tmp/python-build.20170612214128.21462

python2 、python3 安装完毕
查看当前python 版本：pyenv versions

system
2.7
* 3.6.1 (set by /root/.pyenv/version)

默认3.6.1，可以自行检查python版本，这里不做说明
切换到2.7版本 pyenv global 2.7
查看当前python 版本： pyenv versions

system
* 2.7 (set by /root/.pyenv/version)
3.6.1

其他常用命令：

pyenv install --list   #查看可用安装版本，包含pytho、jpython、anaconda、miniconda...