experimental/cpu/: versioneer-0.29 metadata and description

Simple index

Easy VCS-based management of project version strings

author Brian Warner
  • Programming Language :: Python
  • Programming Language :: Python :: 3
  • Programming Language :: Python :: 3.7
  • Programming Language :: Python :: 3.8
  • Programming Language :: Python :: 3.9
  • Programming Language :: Python :: 3.10
  • Programming Language :: Python :: 3.11
  • License :: OSI Approved :: The Unlicense (Unlicense)
description_content_type text/markdown
license This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means. In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. For more information, please refer to <https://unlicense.org/>
maintainer_email Justin Wood <Callek+versioneer@gmail.com>, Nathan Buckner <bucknerns@users.noreply.github.com>
  • Homepage, https://github.com/python-versioneer/python-versioneer
provides_extras toml
  • tomli ; (python_version < "3.11") and extra == 'toml'
requires_python >=3.7
File Tox results History
46 KB
Python Wheel

The Versioneer

This is a tool for managing a recorded version number in setuptools-based python projects. The goal is to remove the tedious and error-prone "update the embedded version string" step from your release process. Making a new release should be as easy as recording a new tag in your version-control system, and maybe making new tarballs.

Quick Install

Versioneer provides two installation modes. The "classic" vendored mode installs a copy of versioneer into your repository. The experimental build-time dependency mode is intended to allow you to skip this step and simplify the process of upgrading.

Vendored mode

Build-time dependency mode

Version Identifiers

Source trees come from a variety of places:

Within each source tree, the version identifier (either a string or a number, this tool is format-agnostic) can come from a variety of places:

For released software, the version identifier is closely related to a VCS tag. Some projects use tag names that include more than just the version string (e.g. "myproject-1.2" instead of just "1.2"), in which case the tool needs to strip the tag prefix to extract the version identifier. For unreleased software (between tags), the version identifier should provide enough information to help developers recreate the same tree, while also giving them an idea of roughly how old the tree is (after version 1.2, before version 1.3). Many VCS systems can report a description that captures this, for example git describe --tags --dirty --always reports things like "0.7-1-g574ab98-dirty" to indicate that the checkout is one revision past the 0.7 tag, has a unique revision id of "574ab98", and is "dirty" (it has uncommitted changes).

The version identifier is used for multiple purposes:

Theory of Operation

Versioneer works by adding a special _version.py file into your source tree, where your __init__.py can import it. This _version.py knows how to dynamically ask the VCS tool for version information at import time.

_version.py also contains $Revision$ markers, and the installation process marks _version.py to have this marker rewritten with a tag name during the git archive command. As a result, generated tarballs will contain enough information to get the proper version.

To allow setup.py to compute a version too, a versioneer.py is added to the top level of your source tree, next to setup.py and the setup.cfg that configures it. This overrides several distutils/setuptools commands to compute the version when invoked, and changes setup.py build and setup.py sdist to replace _version.py with a small static file that contains just the generated version data.


See INSTALL.md for detailed installation instructions.

Version-String Flavors

Code which uses Versioneer can learn about its version string at runtime by importing _version from your main __init__.py file and running the get_versions() function. From the "outside" (e.g. in setup.py), you can import the top-level versioneer.py and run get_versions().

Both functions return a dictionary with different flavors of version information:

Some variants are more useful than others. Including full-revisionid in a bug report should allow developers to reconstruct the exact code being tested (or indicate the presence of local changes that should be shared with the developers). version is suitable for display in an "about" box or a CLI --version output: it can be easily compared against release notes and lists of bugs fixed in various releases.

The installer adds the following text to your __init__.py to place a basic version in YOURPROJECT.__version__:

from ._version import get_versions
__version__ = get_versions()['version']
del get_versions


The setup.cfg style= configuration controls how the VCS information is rendered into a version string.

The default style, "pep440", produces a PEP440-compliant string, equal to the un-prefixed tag name for actual releases, and containing an additional "local version" section with more detail for in-between builds. For Git, this is TAG[+DISTANCE.gHEX[.dirty]] , using information from git describe --tags --dirty --always. For example "0.11+2.g1076c97.dirty" indicates that the tree is like the "1076c97" commit but has uncommitted changes (".dirty"), and that this commit is two revisions ("+2") beyond the "0.11" tag. For released software (exactly equal to a known tag), the identifier will only contain the stripped tag, e.g. "0.11".

Other styles are available. See details.md in the Versioneer source tree for descriptions.


Versioneer tries to avoid fatal errors: if something goes wrong, it will tend to return a version of "0+unknown". To investigate the problem, run setup.py version, which will run the version-lookup code in a verbose mode, and will display the full contents of get_versions() (including the error string, which may help identify what went wrong).

Known Limitations

Some situations are known to cause problems for Versioneer. This details the most significant ones. More can be found on Github issues page.


Versioneer has limited support for source trees in which setup.py is not in the root directory (e.g. setup.py and .git/ are not siblings). The are two common reasons why setup.py might not be in the root:

Versioneer will look for .git in parent directories, and most operations should get the right version string. However pip and setuptools have bugs and implementation details which frequently cause pip install . from a subproject directory to fail to find a correct version string (so it usually defaults to 0+unknown).

pip install --editable . should work correctly. setup.py install might work too.

Pip-8.1.1 is known to have this problem, but hopefully it will get fixed in some later version.

Bug #38 is tracking this issue. The discussion in PR #61 describes the issue from the Versioneer side in more detail. pip PR#3176 and pip PR#3615 contain work to improve pip to let Versioneer work correctly.

Versioneer-0.16 and earlier only looked for a .git directory next to the setup.cfg, so subprojects were completely unsupported with those releases.

Editable installs with setuptools <= 18.5

setup.py develop and pip install --editable . allow you to install a project into a virtualenv once, then continue editing the source code (and test) without re-installing after every change.

"Entry-point scripts" (setup(entry_points={"console_scripts": ..})) are a convenient way to specify executable scripts that should be installed along with the python package.

These both work as expected when using modern setuptools. When using setuptools-18.5 or earlier, however, certain operations will cause pkg_resources.DistributionNotFound errors when running the entrypoint script, which must be resolved by re-installing the package. This happens when the install happens with one version, then the egg_info data is regenerated while a different version is checked out. Many setup.py commands cause egg_info to be rebuilt (including sdist, wheel, and installing into a different virtualenv), so this can be surprising.

Bug #83 describes this one, but upgrading to a newer version of setuptools should probably resolve it.

Updating Versioneer

To upgrade your project to a new release of Versioneer, do the following:

Future Directions

This tool is designed to make it easily extended to other version-control systems: all VCS-specific components are in separate directories like src/git/ . The top-level versioneer.py script is assembled from these components by running make-versioneer.py . In the future, make-versioneer.py will take a VCS name as an argument, and will construct a version of versioneer.py that is specific to the given VCS. It might also take the configuration arguments that are currently provided manually during installation by editing setup.py . Alternatively, it might go the other direction and include code from all supported VCS systems, reducing the number of intermediate scripts.

Similar projects


To make Versioneer easier to embed, all its code is dedicated to the public domain. The _version.py that it creates is also in the public domain. Specifically, both are released under the "Unlicense", as described in https://unlicense.org/.