ModuleNotFoundError: No module named 'setuptools.command.build'

[DannyVarod]

Hi, with latest version of setuptools, some older packages now won't install and output the error:
ModuleNotFoundError: No module named 'setuptools.command.build'
This seems to have started on version 62.4.0
Was there a breaking change in this version?

[abravalheri]

Hi @DannyVarod, in theory there is no breaking change in this version.
Can you post an isolated reproduction here?

Please note that using python setup.py install is deprecated and users are suggested to move to pip.

Als, could you also please confirm which operating system/distribution/version you are using?

[DannyVarod]

This occurred on Linux Ubuntu 20.04.4 while running both pip install -r requirements.txt and python setup.py sdist from Python 3.6.
In Python 3.7+ projects this did not reproduce.

Perhaps for v62.4.0 the Python requirement should be >= 3.7 so older versions of Python will be limited to version 62.3.4 and down which work.

This reproduced on for specific project's build (Ubuntu) + on a specific dev's machine (OS X) for an older Python 3.6 based project.
I'll post a minimal reproduction when I have one.

[abravalheri]

Perhaps for v62.4.0 the Python requirement should be >= 3.7 so older versions of Python will be limited to version 62.3.4 and down which work.

Hi @DannyVarod, this is already true nowadays:

setuptools/setup.cfg

Line 27 in 94955ce

python_requires = >=3.7

Please try to avoid using python setup.py install directly. The recommendation is to replace this command with pip install . whenever possible.

[DannyVarod]

I went over the process again, I see the build checked 2 different requirements files (deployed to two different places) for conflicts, however, they were accidentally done in the same env, despite being dependent on different Python versions, so this seems to have caused this.

[yaegel]

I experienced the same issue (related, in my case, to py7zr). The solution in my build was to upgrade pip (pip3 install --upgrade pip). Hope that helps!