Python: Know whether package is being installed via Pip or an archive is being built (sdist, bdist, bdist_wheel)

check_setup_method.py

import sys

def is_pip_installing():
    return '--python-tag' in sys.argv

def is_building_archive():
    archive_cmds = 'sdist', 'bdist', 'bdist_wheel'
    return (
        not pip_installing() and
        any(cmd in sys.argv for cmd in archive_cmds)
    )

example_usage_setup.py

"""
Example Usage:

Add different keyword arguments to setup() based on command.
"""

from check_setup_method import is_pip_installing, is_building_archive
from setuptools import setup

def check():
    kwarguments = {}
    
    if is_building_archive():
        "Library maintainer is building archive."
        kwarguments['foo'] = 'bar'
        
    elif is_pip_installing():
        "End user is installing this library."
        kwarguments['foozle'] = 'barzle'
    
    return kwarguments

setup(
    ...,
    **check()
)