使用pyenv

这个工具用来方便地切换不同版本的python。

安装

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

我使用的shell是fish，把它加入$PATH里面，因为经常需要把某个路径加入到$PATH里，所以以前写了一个函数，这样查看函数：

❯ functions add_to_path                                                          2s 140ms
function add_to_path --description 'Persistently prepends paths to your PATH'
        set --universal fish_user_paths $fish_user_paths $argv
end

新建函数：

❯ function add_to_path --description 'Persistently prepends paths to your PATH'     396ms
              set --universal fish_user_paths $fish_user_paths $argv
  end

保存函数：

❯ funcsave add_to_path

把pyenv加入到$PATH里面：

❯ add_to_path ~/.pyenv/bin/

更新

pyenv update

帮助

❯ pyenv --help                                                                                            183ms
Usage: pyenv  []

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 executable

另外，列出可安装的python版本：

❯ pyenv install --list

安装某个版本：

❯ pyenv install 2.7.13                                                              137ms
Downloading Python-2.7.13.tar.xz...
-> https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tar.xz
Installing Python-2.7.13...
Installed Python-2.7.13 to /home/repl/.pyenv/versions/2.7.13

效果

然而我发现并没有用。无意中安装了一个fisherman的插件：

fisher pyenv

fisherman是fish的一个插件管理器，如果需要没有安装fisherman：

curl -Lo ~/.config/fish/functions/fisher.fish --create-dirs git.io/fisher

这样就好了：

❯ pyenv versions                                                                    05:59
  system
  2.7.13
  3.5.2
* 3.6.1 (set by /home/repl/.pyenv/version)

repl at Planet in ~
❯ python --version; and pip --version                                               164ms
Python 3.6.1
pip 9.0.1 from /home/repl/.pyenv/versions/3.6.1/lib/python3.6/site-packages (python 3.6)

repl at Planet in ~
❯ pyenv global 2.7.13; and python --version; and pip --version                      919ms
Python 2.7.13
pip 9.0.1 from /home/repl/.pyenv/versions/2.7.13/lib/python2.7/site-packages (python 2.7)