python を pyenv でインストールする

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    $ sudo apt update
    $ sudo apt install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python-openssl git

    $ git clone https://github.com/pyenv/pyenv.git ~/.pyenv
    $ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile
    $ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
    $ echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
    $ source ~/.bash_profile
    $ pyenv -v

    $ pyenv install 3.6.8
    $ sudo apt install python-pip