$ git clone https://github.com/yyuu/pyenv.git ~/.pyenv
export PYENV_ROOT=$HOME/.pyenv export PATH=$PYENV_ROOT/bin:$PATH eval "$(pyenv init -)"
$ source ~/.bash_profile
$ sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils
$ pyenv versions
$ pyenv install --list
$ pyenv install 3.0.1
$ pyenv local 3.0.1
Then your python should be switched to 3.0.1.
S.Yatsuzuka