How to Integrate Post-Install Scripts into Python Setuptools?

Post-Install Script Integration in Python Setuptools

Setupscript has become a remarkable tool for managing and distributing Python projects. It enables developers to automate various tasks, including post-installation procedures. This article explores how to integrate a post-install Python script into your setuptools setup.

Setup Script Modifications

To specify a post-install script, you can customize your setup.py file. This requires creating a custom install command that executes the script upon installation completion. Here's an example:

from setuptools import setup
from setuptools.command.install import install

class PostInstallCommand(install):
    def run(self):
        install.run(self)
        # Call your post-install script or function here

setup(
    ...,
    cmdclass={
        'install': PostInstallCommand,
    },
    ...
)

Development and Installation Modes

Consider that you may need different post-install scripts for development and installation modes. You can create separate commands to handle these scenarios and include them in the cmdclass argument:

class PostDevelopCommand(develop):
    def run(self):
        develop.run(self)
        # Add development-specific post-install script here

class PostInstallCommand(install):
    def run(self):
        install.run(self)
        # Add installation-specific post-install script here

setup(
    ...,
    cmdclass={
        'develop': PostDevelopCommand,
        'install': PostInstallCommand,
    },
    ...
)

Shell Commands

If you need to execute shell commands as part of your post-install script, setuptools provides a convenient way to do so using the check_call function:

from setuptools import setup
from setuptools.command.install import install
from subprocess import check_call

class PostInstallCommand(install):
    def run(self):
        check_call("apt-get install this-package".split())
        install.run(self)

setup(
    ...,
    cmdclass={
        'install': PostInstallCommand,
    },
    ...
)

This allows you to perform any necessary system configuration or resource installation during the installation process.

Note: This solution works only for source distribution installations (e.g., from tarballs or zip files) or installations in editable mode. It will not work when installing from pre-built binary wheels (.whl files).

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