How can I add the customed commend into the setup.py and when user execute the commend pip install <package>, the customed cmd can be called and executed?

[BertramYe]

just like the code below, I have do some of the google, lots of the blogs or article told me that if I want the self-defined cmd (os.makedirs('/path/to/directory', exist_ok=True)) like here below can be executed and called when user execute cmd pip install <package>, I should just do like below, add the calss CreateDirectoryCommand into the cmdclass, but when I did it, I found that the self-defined cmd can't be called at all,but will call when you do the buid python -m build, but I dan't want it, I just want the cmd can be executed when the user install the package with the cmd pip install <pacakge>, how how can I do?

# setup.py

import os
from setuptools import setup, Command

class CreateDirectoryCommand(Command):
    description = "Create a directory during installation"
    user_options = []

    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def run(self):
        # execute the self defined cmd
        os.makedirs('/path/to/directory', exist_ok=True)

setup(
    name='tester_packager',
    version='0.1',
    description='Your package description',
    cmdclass={
        'create_directory': CreateDirectoryCommand,
    },
  .........
)

[abravalheri]

I am not sure if I understand the question. Setuptools cannot create directories by itself in the moment of the installation. What setuptools can do is to create files inside the wheel archive (which is basically a zip file), and then later the installer (e.g. pip) will copy those files to the end user's machine.

Because the wheel is produced in a machine that can be different than the one owned by the end user (and often that is the case), there is no room for running hooks during installation time in setuptools. The installation is performed by a completely separated tool (e.g. pip).

[BertramYe]

@abravalheri ok, for example, if I packaged a lib but to make the package works , I need the user pre download some of the resources from a remote link, so in this time, I hope the resources can be auto-downloaded when the user execute the 'pip install'. and that's why I hope I can packaged the cmd I defined into the wheel,when the user excite 'pip install', the customed cmd can be run as well, and also I have tried put the customed cmd into the parameter 'cmdclass' of the setup function, just like the make for logical, but per I tested when I run pip install the wheel files I packaged, the customed cmd didn't run, so how can I do ?

[abravalheri]

I don't think you can, or at least that is not a question in the scope of setuptools (setuptools does not participate in the process of installing .whl files).

Some programs get around that by verifying on the first run if the end users have all the necessary files and if not downloading them on the spot. Other programs offer an option in the CLI/GUI for the user to trigger the download. But that is outside of the scope of setuptools.

[BertramYe]

OK， got it.