pyenv virtualenv

1** Install Dependencies:

sudo apt-get update && sudo apt-get install make build-essential libssl-dev \
    zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \
    libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev

2** Install Pyenv:

curl https://pyenv.run | bash

3** Config ~/.profile (copy and paste):

# Load pyenv automatically by appending
# the following to
# ~/.bash_profile if it exists, otherwise ~/.profile (for login shells)
# and ~/.bashrc (for interactive shells) :

export PYENV_ROOT="$HOME/.pyenv"
[[ -d $PYENV_ROOT/bin ]] && export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"

4** config ~/.bashrc (copy and paste):

eval "$(pyenv virtualenv-init -)"

5** reload enviroment:pyenv install

source ~/.bashrcpyenv install

6** Install python version 2.7:

pyenv install 2.7

7** create an venv over python version 2.7 (without < >)

pyenv virtualenv 2.7 <virtual_env_name>