Ubuntu 18.04 install python3 with pip and pyenv - for multiple python versions

ubuntu-18.04-pipenv.bash

# install dependencies
sudo apt install -y make build-essential \
python3 python-pip libpq-dev python3-dev 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

# pyenv for installing different python versions
git clone https://github.com/pyenv/pyenv.git ~/.pyenv

# export pyenv path for python environments
export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
OR
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(pyenv init --path)"' >> ~/.bashrc


eval "$(pyenv init -)"

# install pipenv
sudo -H pip install -U pipenv
pip install --user pipenv

# list versions available
pyenv install --list 

# list only 3.6 3.7 3.8
pyenv install --list | grep " 3\.[678]" 

# installed versions
pyenv versions

# install specific version
pyenv install 3.7.6

# use specifiv version
pyenv global 3.7.6

# uninstall specific version
pyenv uninstall 3.7.6