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环境准备

pyenv

• 安装Python解释器
• 管理Python版本
• 管理Python虚拟环境
  相当于一个独立的版本,是bash写的一个程序，所以没有依赖；

• pyenv github地址

https://github.com/yyuu/pyenv-installer

• 苹果系统安装pyenv

# curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash
# sudo vim /etc/bashrc
export PATH="/Users/ssjinyao/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"
# source  /etc/bashrc

• linux系统安装pyenv

# curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash
# vim /etc/profile.d/pyenv.sh
export PATH="/Users/ssjinyao/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

• 安装一个python的依赖（CentOS）

# yum -y install. gcc make patch gdbm-devel openssl-devel sqlite-devel zlib-devel bzip2-devel readline-devel
# 注：在不同的linux系统上安装包的名字不一样

• pyenv安装一个python版本

# pyenv update #用来更新pyenv
# pyenv install 3.5.2

• 切换python 3.5.3

bogon:~ ssjinyao$ pyenv local 3.5.2
bogon:~ ssjinyao$ pyenv version
3.5.2 (set by /Users/ssjinyao/.python-version)
bogon:~ ssjinyao$ cat .python-version 
3.5.2

• 切换python到系统版本

bogon:~ ssjinyao$ pyenv local system
bogon:~ ssjinyao$ pyenv version
system (set by /Users/ssjinyao/.python-version)

• 切换全局python变量（希望永远不要执行）

# pyenv global x.x.x

使用pyenv

• local 命令
  local 命令切换当前目录及其子目录的Python版本
  如何恢复，可以通过删除 ‘.python-version’恢复默认的Python版本

• global 命令
  global命令切换全局默认python版本

bogon:~ ssjinyao$ pyenv commands
--version
activate
commands
completions
deactivate
doctor
exec
global
help
hooks
init
install
installer
local
offline-installer
prefix
rehash
root
shell
shims
uninstall
update
version
version-file
version-file-read
version-file-write
version-name
version-origin
versions
virtualenv
virtualenv-delete
virtualenv-init
virtualenv-prefix
virtualenvs
whence
which

bogon:~ ssjinyao$ pyenv  virtualenv 3.5.2 magedu
Ignoring indexes: https://pypi.python.org/simple
Requirement already satisfied (use --upgrade to upgrade): setuptools in /Users/ssjinyao/.pyenv/versions/3.5.2/envs/magedu/lib/python3.5/site-packages
Requirement already satisfied (use --upgrade to upgrade): pip in /Users/ssjinyao/.pyenv/versions/3.5.2/envs/magedu/lib/python3.5/site-packages  
bogon:~ ssjinyao$ pyenv local 3.5.2/envs/magedu 
(3.5.2/envs/magedu) bogon:~ ssjinyao$ 
(3.5.2/envs/magedu) bogon:~ ssjinyao$ pyenv local 3.5.2
bogon:~ ssjinyao$ 
bogon:~ ssjinyao$ ls -l ~/.pyenv/versions/ 
total 8
drwxr-xr-x  7 ssjinyao  staff  238 11 19 10:30 3.5.2
lrwxr-xr-x  1 ssjinyao  staff   49 11 19 10:35 magedu -> /Users/ssjinyao/.pyenv/versions/3.5.2/envs/magedu

bogon:~ ssjinyao$ pyenv versions
  system
* 3.5.2 (set by /Users/ssjinyao/.python-version)
  3.5.2/envs/magedu
  magedu
bogon:~ ssjinyao$ pyenv uninstall magedu
pyenv-virtualenv: remove /Users/ssjinyao/.pyenv/versions/3.5.2/envs/magedu? y
bogon:~ ssjinyao$ pyenv versions
  system
* 3.5.2 (set by /Users/ssjinyao/.python-version)

• virtualenv 命令
  创建虚拟环境 pyenv virtualenv $bash_version $name

• uninstall 命令
  卸载某个版本，包括虚拟环境；

选择python版本时，可以这样选择

bogon:~ ssjinyao$ ls ~/.pyenv/versions/3.5.2/envs/magedu/bin/python
/Users/ssjinyao/.pyenv/versions/3.5.2/envs/magedu/bin/python

vim python插件（jedi）

vim python插件包 （maximum-awesome）%