Script to start a new python environment using pyenv. Install latest python. Create a virtualenv. Upgrade pip. usage: pystart.sh name-of-env

pystart.sh

#!/bin/bash

env_name=$1
echo "Making new Python environment '$1'"

# Find the latest mainline version of Python available
latest_python=$(pyenv install --list | grep -E "^\s*[3]\.[0-9]+\.[0-9]+$" | grep -v "[a-zA-Z]" | tail -1)
# Strip whitespace:
latest_python=$(echo "$latest_python" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')

echo "Latest Python: $latest_python"

# Check if the latest Python version is already installed.
if pyenv versions --bare | grep -q "$latest_python"; then
  echo "Python version $latest_python is already installed"
else
  echo "Installing python $latest_python"
  pyenv install $latest_python
fi

pyenv virtualenv "$latest_python" "$env_name"
pyenv local "$env_name"
python -m pip install --upgrade pip

Assumes you have functioning pyenv installed.