setup python prerequisities

pristine-setup.sh

#!/usr/bin/env bash

  set -eu
  PYTHON_VERSION=3.7.5
  POETRY_URL=https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py

  has() {
      type $1 > /dev/null 2>&1
  }

  echo "Ensure pyenv is installed"
  has pyenv || (echo "pyenv required, see https://github.com/pyenv/pyenv" && exit 1)

  echo "Installing decent Python ($PYTHON_VERSION)"
  (pyenv versions | grep -q $PYTHON_VERSION) || pyenv install $PYTHON_VERSION

  echo "Set system default to $PYTHON_VERSION"
  pyenv global $PYTHON_VERSION

  echo "Install poetry"
  has poetry || (curl -sSL $POETRY_URL | python)


  echo "Install invoke"
  pip install -U pip invoke