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$ git clone git://github.com/yyuu/pyenv.git ~/.pyenv
$ echo 'export PYENV_ROOT="$HOME/.pyenv"'>> ~/.bashrc # 指明环境变量
$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"'>> ~/.bashrc
$ echo 'eval"$(pyenv init -)"' >> ~/.bashrc  # 开启shims and autocompletion
$ exec $SHELL -l  # 重新启动shell让其生效 

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$ brew update
$ brew install pyenv //安装
$ brew upgrade pyenv //升级
$ echo 'eval "$(pyenv init -)"' >> ~/.bash_profile //只需要执行一次即可

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$ pyenv install --list

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$ pyenv install 3.5.1 -v

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$ pyenv rehash

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 $ pyenv versions 
 * system (set by /Users/ce/workspace/sohu/.python-version)
  3.5.1
  sohu351

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$ pyenv global 3.5.1
$ pyenv versions
system
* 3.5.1 (set by /Users/ce/workspace/sohu/.python-version)

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$ pip install virtualenvwrapper
$ git clone https://github.com/yyuu/pyenv-virtualenvwrapper.git ~/.pyenv/plugins/pyenv-virtualenvwrapper

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$ pip install virtualenvwrapper
$ brew install pyenv-virtualenvwrapper

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$ mkvirtualenv env2 -p $(which python3.5)
$ workon env2

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git clone https://github.com/direnv/direnv
cd direnv
make install

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use_venv () {
      export VIRTUAL_ENV = "${HOME} /.virtualenvs/${1}"
      PATH_add "$VIRTUAL_ENV/bin"
  }

 use_vwrapper () {
     source /usr/local/bin/virtualenvwrapper.sh
 }

 use_python() {
       local python_root=$HOME/.pyenv/versions/$1
       load_prefix "$python_root"
       layout_python "$python_root/bin/python"
 }

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layout python
use vwrapper
workon env2