Trouble following packaging libraries tutorial - build module does not work when using a virtualenv

[Zeebrow]

Thank you for providing feedback on Python packaging!

To help us help you, please fill out as much of the following as you can. If a question is not relevant, feel free to skip it.

1. What is your operating system and version?

CentOS Linux release 8.3.2011
Linux -hostname- 4.18.0-240.15.1.el8_3.x86_64 #1 SMP Mon Mar 1 17:16:16 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

2. What is your Python version?

system python3:
Python 3.6.8

virtualenv:
Python 3.6.8

3. What version of pip do you have?

system pip3:
pip 21.1.1 from /usr/local/lib/python3.6/site-packages/pip (python 3.6)

virtualenv:
pip 21.1.1 from /home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/pip (python 3.6)

4. If following an online tutorial or guide, please provide a link to the page or section giving you trouble:

https://packaging.python.org/tutorials/packaging-projects/#generating-distribution-archives

5. Could you describe your issue in as much detail as possible?

I followed the tutorial up to the link above, and python3 -m build ran successfully. I got to the next step, which requires twine. I tried installing, but it conflicted with a dependency. No problem, I'll make a virtualenv and start the section over (python and pip versions given above are from virtualenv). I then ran source venv/bin/activate, python3 -m pip install --upgrade build (no --user options when using virtualenv) and python3 -m build. This gives the following Traceback: (apologies in advance for formatting)

(venv-build) [mike@homelab dcabot-minimal]$ python3 -m build
Traceback (most recent call last):
  File "/usr/lib64/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib64/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/build/__main__.py", line 214, in <module>
    main(sys.argv[1:], 'python -m build')
  File "/home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/build/__main__.py", line 206, in main
    build_package(args.srcdir, outdir, distributions, config_settings, not args.no_isolation, args.skip_dependencies)
  File "/home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/build/__main__.py", line 94, in build_package
    _build_in_isolated_env(builder, outdir, distributions, config_settings)
  File "/home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/build/__main__.py", line 52, in _build_in_isolated_env
    with IsolatedEnvBuilder() as env:
  File "/home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/build/env.py", line 91, in __enter__
    executable, scripts_dir = _create_isolated_env_venv(self._path)
  File "/home/mike/bin/dcabot-minimal/venv-build/lib/python3.6/site-packages/build/env.py", line 203, in _create_isolated_env_venv
    pip_distribution = next(iter(metadata.distributions(name='pip', path=[purelib])))

Deactivating virtualenv and using the system's python/pip still works. Both virtualenv and system use build==0.3.1.post1

[Zeebrow]

P.S. I was able to complete the tutorial by putting twine in a virtualenv. Thanks a bunch!

[layday]

This is probably pypa/build#266. Please install build with the virtualenv extra: python3 -m pip install -U build[virtualenv].

[layday]

I'll close this one now. Please comment below if you're still facing an issue.