[BUG] Calling `pip install .` to build/install setuptools multiple times in a row results in unwanted `build/lib/...` files

### setuptools version



70



### Python version



3.12



### OS



Tested on `python:3.12-bookworm` linux container



### Additional environment information



_No response_



### Description



Running `pip install .` multiple times to install the `setuptools` project itself results in installing

unwanted `build/lib/...` files into `site-packages`.



Running `pip wheel .` multiple times (or after running `pip install .`) results in unwanted `build/lib/...` files in the created wheel.



I suspect that the root cause of this problem is that setuptools is configured to find packages using an `exclude` rule, but this exclude rule does not exclude the `build` directory. It is also considered to find namespace packages.



In the [regular finder implementation](https://github.com/pypa/setuptools/blob/v70.0.0/setuptools/discovery.py#L137-L179) there is no special provision to ignore those files (and to honest, my opinion is that there should not be one because packages can choose the name `build`..., before `build` migrated to `flit` that was exactly the case).



For the default, automatic discovery there is a [provision](https://github.com/pypa/setuptools/blob/v70.0.0/setuptools/discovery.py#L234) in place to avoid that directory.





I expect this problem to be the same before v70 (I haven't tested though).



### Expected behavior



When building/insalling the `setuptools` repository there should be not `build/lib/...` in the site-packages directory or in the wheel. This should be "idempotent" (it does not matter how many times you build/install).



### How to Reproduce



```bash

> docker run --rm -it python:3.12-bookworm /bin/bash



apt update -y && apt install tree -y

tree -L 2 /usr/local/lib/python3.12/site-packages/build

# /usr/local/lib/python3.12/site-packages/build  [error opening dir]

# 0 directories, 0 files



git clone https://github.com/pypa/setuptools.git /tmp/setuptools

cd /tmp/setuptools

python -m pip install -U pip

python -m pip install .



tree -L 2 /usr/local/lib/python3.12/site-packages/build

# /usr/local/lib/python3.12/site-packages/build  [error opening dir]

# 0 directories, 0 files



tree -L 2 build

# build

# ├── bdist.linux-x86_64

# └── lib

#    ├── _distutils_hack

#    ├── pkg_resources

#    └── setuptools



python -m pip install .



tree -L 2 /usr/local/lib/python3.12/site-packages/build

# /usr/local/lib/python3.12/site-packages/build

# └── lib

#    ├── _distutils_hack

#    ├── pkg_resources

#    └── setuptools





tree -L 2 build

# build

# ├── bdist.linux-x86_64

# └── lib

#     ├── _distutils_hack

#     ├── build   <----------------------------------- Starts to be "recursive"

#     ├── pkg_resources

#     └── setuptools





python -m pip install .



tree -L 2 /usr/local/lib/python3.12/site-packages/build

# /usr/local/lib/python3.12/site-packages/build

# └── lib

#     ├── _distutils_hack

#     ├── build   <----------------------------------- "recursive"

#     ├── pkg_resources

#     └── setuptools

```



Now if we use `pip wheel .` we can see that all these spurious directories are included in the wheel:



```bash

python -m pip wheel .

unzip -Z1 setuptools-*.whl | grep 'build/'

# build/lib/_distutils_hack/__init__.py

# build/lib/_distutils_hack/override.py

# build/lib/build/lib/_distutils_hack/__init__.py

# build/lib/build/lib/_distutils_hack/override.py

# build/lib/build/lib/build/lib/_distutils_hack/__init__.py

# build/lib/build/lib/build/lib/_distutils_hack/override.py

# build/lib/build/lib/build/lib/pkg_resources/__init__.py

# build/lib/build/lib/build/lib/pkg_resources/_vendor/__init__.py

# build/lib/build/lib/build/lib/pkg_resources/_vendor/zipp.py

# build/lib/build/lib/build/lib/pkg_resources/_vendor/backports/__init_

# ...

```



<details>



<summary>Full output</summary>



```console

build/lib/_distutils_hack/__init__.py

build/lib/_distutils_hack/override.py

build/lib/build/lib/_distutils_hack/__init__.py

build/lib/build/lib/_distutils_hack/override.py

build/lib/build/lib/build/lib/_distutils_hack/__init__.py

build/lib/build/lib/build/lib/_distutils_hack/override.py

build/lib/build/lib/build/lib/pkg_resources/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/zipp.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/backports/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/backports/tarfile.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/_adapters.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/_common.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/_compat.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/_itertools.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/_legacy.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/abc.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/py.typed

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/readers.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/importlib_resources/simple.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/jaraco/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/jaraco/context.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/jaraco/functools/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/jaraco/functools/__init__.pyi

build/lib/build/lib/build/lib/pkg_resources/_vendor/jaraco/functools/py.typed

build/lib/build/lib/build/lib/pkg_resources/_vendor/jaraco/text/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/__init__.pyi

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/more.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/more.pyi

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/py.typed

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/recipes.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/more_itertools/recipes.pyi

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/_elffile.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/_manylinux.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/_musllinux.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/_parser.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/_structures.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/_tokenizer.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/markers.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/metadata.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/py.typed

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/requirements.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/specifiers.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/tags.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/utils.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/packaging/version.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/__init__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/__main__.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/android.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/api.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/macos.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/py.typed

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/unix.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/version.py

build/lib/build/lib/build/lib/pkg_resources/_vendor/platformdirs/windows.py

build/lib/build/lib/build/lib/pkg_resources/extern/__init__.py

build/lib/build/lib/build/lib/setuptools/__init__.py

build/lib/build/lib/build/lib/setuptools/_core_metadata.py

build/lib/build/lib/build/lib/setuptools/_entry_points.py

build/lib/build/lib/build/lib/setuptools/_imp.py

build/lib/build/lib/build/lib/setuptools/_importlib.py

build/lib/build/lib/build/lib/setuptools/_itertools.py

build/lib/build/lib/build/lib/setuptools/_normalization.py

build/lib/build/lib/build/lib/setuptools/_path.py

build/lib/build/lib/build/lib/setuptools/_reqs.py

build/lib/build/lib/build/lib/setuptools/archive_util.py

build/lib/build/lib/build/lib/setuptools/build_meta.py

build/lib/build/lib/build/lib/setuptools/depends.py

build/lib/build/lib/build/lib/setuptools/discovery.py

build/lib/build/lib/build/lib/setuptools/dist.py

build/lib/build/lib/build/lib/setuptools/errors.py

build/lib/build/lib/build/lib/setuptools/extension.py

build/lib/build/lib/build/lib/setuptools/glob.py

build/lib/build/lib/build/lib/setuptools/installer.py

build/lib/build/lib/build/lib/setuptools/launch.py

build/lib/build/lib/build/lib/setuptools/logging.py

build/lib/build/lib/build/lib/setuptools/modified.py

build/lib/build/lib/build/lib/setuptools/monkey.py

build/lib/build/lib/build/lib/setuptools/msvc.py

build/lib/build/lib/build/lib/setuptools/namespaces.py

build/lib/build/lib/build/lib/setuptools/package_index.py

build/lib/build/lib/build/lib/setuptools/sandbox.py

build/lib/build/lib/build/lib/setuptools/unicode_utils.py

build/lib/build/lib/build/lib/setuptools/version.py

build/lib/build/lib/build/lib/setuptools/warnings.py

build/lib/build/lib/build/lib/setuptools/wheel.py

build/lib/build/lib/build/lib/setuptools/windows_support.py

build/lib/build/lib/build/lib/setuptools/_distutils/__init__.py

build/lib/build/lib/build/lib/setuptools/_distutils/_collections.py

build/lib/build/lib/build/lib/setuptools/_distutils/_functools.py

build/lib/build/lib/build/lib/setuptools/_distutils/_itertools.py

build/lib/build/lib/build/lib/setuptools/_distutils/_log.py

build/lib/build/lib/build/lib/setuptools/_distutils/_macos_compat.py

build/lib/build/lib/build/lib/setuptools/_distutils/_modified.py

build/lib/build/lib/build/lib/setuptools/_distutils/_msvccompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/archive_util.py

build/lib/build/lib/build/lib/setuptools/_distutils/bcppcompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/ccompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/cmd.py

build/lib/build/lib/build/lib/setuptools/_distutils/config.py

build/lib/build/lib/build/lib/setuptools/_distutils/core.py

build/lib/build/lib/build/lib/setuptools/_distutils/cygwinccompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/debug.py

build/lib/build/lib/build/lib/setuptools/_distutils/dep_util.py

build/lib/build/lib/build/lib/setuptools/_distutils/dir_util.py

build/lib/build/lib/build/lib/setuptools/_distutils/dist.py

build/lib/build/lib/build/lib/setuptools/_distutils/errors.py

build/lib/build/lib/build/lib/setuptools/_distutils/extension.py

build/lib/build/lib/build/lib/setuptools/_distutils/fancy_getopt.py

build/lib/build/lib/build/lib/setuptools/_distutils/file_util.py

build/lib/build/lib/build/lib/setuptools/_distutils/filelist.py

build/lib/build/lib/build/lib/setuptools/_distutils/log.py

build/lib/build/lib/build/lib/setuptools/_distutils/msvc9compiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/msvccompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/py38compat.py

build/lib/build/lib/build/lib/setuptools/_distutils/py39compat.py

build/lib/build/lib/build/lib/setuptools/_distutils/spawn.py

build/lib/build/lib/build/lib/setuptools/_distutils/sysconfig.py

build/lib/build/lib/build/lib/setuptools/_distutils/text_file.py

build/lib/build/lib/build/lib/setuptools/_distutils/unixccompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/util.py

build/lib/build/lib/build/lib/setuptools/_distutils/version.py

build/lib/build/lib/build/lib/setuptools/_distutils/versionpredicate.py

build/lib/build/lib/build/lib/setuptools/_distutils/zosccompiler.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/__init__.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/_framework_compat.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/bdist.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/bdist_dumb.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/bdist_rpm.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/build.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/build_clib.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/build_ext.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/build_py.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/build_scripts.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/check.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/clean.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/config.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/install.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/install_data.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/install_egg_info.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/install_headers.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/install_lib.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/install_scripts.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/register.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/sdist.py

build/lib/build/lib/build/lib/setuptools/_distutils/command/upload.py

build/lib/build/lib/build/lib/setuptools/_distutils/compat/__init__.py

build/lib/build/lib/build/lib/setuptools/_distutils/compat/py38.py

build/lib/build/lib/build/lib/setuptools/_vendor/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/ordered_set.py

build/lib/build/lib/build/lib/setuptools/_vendor/zipp.py

build/lib/build/lib/build/lib/setuptools/_vendor/backports/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/backports/tarfile.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_adapters.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_collections.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_compat.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_functools.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_itertools.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_meta.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_py39compat.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/_text.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_metadata/py.typed

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/_adapters.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/_common.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/_compat.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/_itertools.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/_legacy.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/abc.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/py.typed

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/readers.py

build/lib/build/lib/build/lib/setuptools/_vendor/importlib_resources/simple.py

build/lib/build/lib/build/lib/setuptools/_vendor/jaraco/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/jaraco/context.py

build/lib/build/lib/build/lib/setuptools/_vendor/jaraco/functools/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/jaraco/functools/__init__.pyi

build/lib/build/lib/build/lib/setuptools/_vendor/jaraco/functools/py.typed

build/lib/build/lib/build/lib/setuptools/_vendor/jaraco/text/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/__init__.pyi

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/more.py

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/more.pyi

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/py.typed

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/recipes.py

build/lib/build/lib/build/lib/setuptools/_vendor/more_itertools/recipes.pyi

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/_elffile.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/_manylinux.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/_musllinux.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/_parser.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/_structures.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/_tokenizer.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/markers.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/metadata.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/py.typed

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/requirements.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/specifiers.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/tags.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/utils.py

build/lib/build/lib/build/lib/setuptools/_vendor/packaging/version.py

build/lib/build/lib/build/lib/setuptools/_vendor/tomli/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/tomli/_parser.py

build/lib/build/lib/build/lib/setuptools/_vendor/tomli/_re.py

build/lib/build/lib/build/lib/setuptools/_vendor/tomli/_types.py

build/lib/build/lib/build/lib/setuptools/_vendor/tomli/py.typed

build/lib/build/lib/build/lib/setuptools/_vendor/wheel/__init__.py

build/lib/build/lib/build/lib/setuptools/_vendor/wheel/macosx_libfile.py

build/lib/build/lib/build/lib/setuptools/_vendor/wheel/metadata.py

build/lib/build/lib/build/lib/setuptools/_vendor/wheel/util.py

build/lib/build/lib/build/lib/setuptools/_vendor/wheel/wheelfile.py

build/lib/build/lib/build/lib/setuptools/command/__init__.py

build/lib/build/lib/build/lib/setuptools/command/_requirestxt.py

build/lib/build/lib/build/lib/setuptools/command/alias.py

build/lib/build/lib/build/lib/setuptools/command/bdist_egg.py

build/lib/build/lib/build/lib/setuptools/command/bdist_rpm.py

build/lib/build/lib/build/lib/setuptools/command/bdist_wheel.py

build/lib/build/lib/build/lib/setuptools/command/build.py

build/lib/build/lib/build/lib/setuptools/command/build_clib.py

build/lib/build/lib/build/lib/setuptools/command/build_ext.py

build/lib/build/lib/build/lib/setuptools/command/build_py.py

build/lib/build/lib/build/lib/setuptools/command/develop.py

build/lib/build/lib/build/lib/setuptools/command/dist_info.py

build/lib/build/lib/build/lib/setuptools/command/easy_install.py

build/lib/build/lib/build/lib/setuptools/command/editable_wheel.py

build/lib/build/lib/build/lib/setuptools/command/egg_info.py

build/lib/build/lib/build/lib/setuptools/command/install.py

build/lib/build/lib/build/lib/setuptools/command/install_egg_info.py

build/lib/build/lib/build/lib/setuptools/command/install_lib.py

build/lib/build/lib/build/lib/setuptools/command/install_scripts.py

build/lib/build/lib/build/lib/setuptools/command/register.py

build/lib/build/lib/build/lib/setuptools/command/rotate.py

build/lib/build/lib/build/lib/setuptools/command/saveopts.py

build/lib/build/lib/build/lib/setuptools/command/sdist.py

build/lib/build/lib/build/lib/setuptools/command/setopt.py

build/lib/build/lib/build/lib/setuptools/command/test.py

build/lib/build/lib/build/lib/setuptools/command/upload.py

build/lib/build/lib/build/lib/setuptools/command/upload_docs.py

build/lib/build/lib/build/lib/setuptools/compat/__init__.py

build/lib/build/lib/build/lib/setuptools/compat/py310.py

build/lib/build/lib/build/lib/setuptools/compat/py311.py

build/lib/build/lib/build/lib/setuptools/compat/py39.py

build/lib/build/lib/build/lib/setuptools/config/__init__.py

build/lib/build/lib/build/lib/setuptools/config/_apply_pyprojecttoml.py

build/lib/build/lib/build/lib/setuptools/config/expand.py

build/lib/build/lib/build/lib/setuptools/config/pyprojecttoml.py

build/lib/build/lib/build/lib/setuptools/config/setupcfg.py

build/lib/build/lib/build/lib/setuptools/config/_validate_pyproject/__init__.py

build/lib/build/lib/build/lib/setuptools/config/_validate_pyproject/error_reporting.py

build/lib/build/lib/build/lib/setuptools/config/_validate_pyproject/extra_validations.py

build/lib/build/lib/build/lib/setuptools/config/_validate_pyproject/fastjsonschema_exceptions.py

build/lib/build/lib/build/lib/setuptools/config/_validate_pyproject/fastjsonschema_validations.py

build/lib/build/lib/build/lib/setuptools/config/_validate_pyproject/formats.py

build/lib/build/lib/build/lib/setuptools/extern/__init__.py

build/lib/build/lib/pkg_resources/__init__.py

build/lib/build/lib/pkg_resources/_vendor/__init__.py

build/lib/build/lib/pkg_resources/_vendor/zipp.py

build/lib/build/lib/pkg_resources/_vendor/backports/__init__.py

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build/lib/setuptools/_vendor/importlib_metadata/_text.py

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build/lib/setuptools/config/_validate_pyproject/extra_validations.py

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build/lib/setuptools/config/_validate_pyproject/formats.py

build/lib/setuptools/extern/__init__.py

```



</details>



This does not happen with `python -m build`, but I guess `build` copies the directory to a temporary directory before running? (and that prevents the `build` directory from being created in the CWD?)



Other than `pip install .` or `pip wheel .`, running the test suite with `tox` itself also produces the `build` directory, so if anyone tries to run `tox` before `pip install .`, they also end-up with spurious files.



Another related thought:



In the time that setuptools/distutils was created this was not a concern, because namespace packages were not a thing. So setuptools/distutils could use a `build` or `dist` directories without a problem for build artifacts without having any concern for those to be accidentally counted as Python packages during the build. But since PEP 440 was introduced, that no longer holds.

[]