pyenv-activate

#!/usr/bin/env bash
#
# Summary: Activate virtual environment
#
# Usage: pyenv activate <virtualenv>
#        pyenv activate --unset
#
# Activate a Python virtualenv environment in current shell.
# This acts almost as same as `pyenv shell`, but this invokes the `activate`
# script in your shell.
#
# <virtualenv> should be a string matching a Python version known to pyenv.

set -e
[ -n "$PYENV_DEBUG" ] && set -x

# Provide pyenv completions
if [ "$1" = "--complete" ]; then
  echo --unset
  exec pyenv-virtualenvs --bare --only-aliases
fi

{ printf "\x1B[31;1m"
  echo
  echo "\`pyenv activate' requires Pyenv and Pyenv-Virtualenv to be loaded into your shell."
  echo "Check your shell configuration and Pyenv and Pyenv-Virtualenv installation instructions."
  echo
  printf "\x1B[0m"
} 1>&2
exit 1