setup.py

#!/usr/bin/env python

# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
import sys

from setuptools import setup  # type:ignore[import]
from setuptools.command.bdist_egg import bdist_egg  # type:ignore[import]


class bdist_egg_disabled(bdist_egg):
    """Disabled version of bdist_egg

    Prevents setup.py install from performing setuptools' default easy_install,
    which it should never ever do.
    """

    def run(self):
        sys.exit("Aborting implicit building of eggs. Use `pip install .` to install from source.")


# Loads metadata and options from setup.cfg:
setup(
    cmdclass={
        "bdist_egg": bdist_egg if "bdist_egg" in sys.argv else bdist_egg_disabled,
    },
)