How to install a Python package with setup.py + tox

fix_virtualenv.sh

#!/usr/bin/env bash

ENV_PATH="$(dirname "$(dirname "$(which pip)")")"
SYSTEM_VIRTUALENV="$(which -a virtualenv|tail -1)"

BAD_ENV_PATHS="/usr/local"

echo "Ensure the root of the broken virtualenv:"
echo "    $ENV_PATH"

if [[ -z "$ENV_PATH" ]] || [[ "$ENV_PATH" = *"$BAD_ENV_PATHS"* ]]; then
    echo "The root path above doesn't seems to be a valid one."
    echo "Please make sure you ACTIVATED the broken virtualenv."
    echo "‼️  Exiting for your safety... (thanks @laymonk for reporting this)"
    exit 1
fi

read -p "‼️  Press Enter if you are not sure (y/N) " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]; then
    echo "♻️  Removing old symbolic links......"
    find "$ENV_PATH" -type l -delete -print
    echo "💫  Creating new symbolic links......"
    $SYSTEM_VIRTUALENV "$ENV_PATH"
    echo "🎉  Done!"
fi

setup_install.sh

# change into project directory
cd project_name

# build the package
python3 setup.py build

# activate virtualenv, or make one if doesn't exist
virtualenv -p `which python3` ~/venv
source ~/venv/bin/activate

# install tox, if it is not already installed
pip3 install tox

# run tox
tox

# if tox reports errors (i.e., with flake8), fix and redo previous step
# if tox exits cleanly, install
./setup.py install

# verify installation by using `which command_name`
# should point to ~/venv/bin/project_name
which command_name

# if this error appears (or similar):
# dyld: Library not loaded: @executable_path/../.Python
#   Referenced from: ~/venv/bin/python3
#   Reason: image not found
# Abort trap: 6
#
# fix: https://gist.github.com/tevino/1a557a0c200d61d4e4fb
# if the above Gist ever gets deleted, its contents are replicated in the file fix_virtualenv.sh in this Gist
# run the following:
sh <(curl -sL https://gist.github.com/tevino/1a557a0c200d61d4e4fb/raw/e5932f9923e57dcb41db32fe5bed9acc6d584be4/fix_virtualenv)