pythonsetuptoolssetup.pypython-packaging

Reputation: 5363

Standard way to embed version into Python package?

Is there a standard way to associate version string with a Python package in such way that I could do the following?

import foo
print(foo.version)

I would imagine there's some way to retrieve that data without any extra hardcoding, since minor/major strings are specified in setup.py already. Alternative solution that I found was to have import __version__ in my foo/__init__.py and then have __version__.py generated by setup.py.

Upvotes: 415

Answers (25)

ingyhere

Reputation: 13831

Lots of work toward uniform versioning and in support of conventions has been completed since this question was first asked. Palatable options are now detailed in the Python Packaging User Guide. Also noteworthy is that version number schemes are relatively strict in Python per PEP 440, and so keeping things sane is critical if your package will be released to the Python Package Index (PyPI).

Here's a shortened breakdown of versioning options:

Read the file in setup.py (setuptools) and get the version.
Use an external build tool (to update both __init__.py as well as source control), e.g. bump2version, changes or zest.releaser.
Set the value to a __version__ global variable in a specific module.
Place the value in a simple VERSION text file for both setup.py and code to read.
Set the value via a setup.py release, and use importlib.metadata to pick it up at runtime. (Warning, there are pre-3.8 and post-3.8 versions.)
Set the value to __version__ in sample/__init__.py and import sample in setup.py.
Use setuptools_scm to extract versioning from source control so that it's the canonical reference, not code.

NOTE that (7) might be the most modern approach (build metadata is independent of code, published by automation). Also NOTE that if setup is used for package release that a simple python3 setup.py --version will report the version directly.

Upvotes: 14

Levon

Reputation: 11932

pbr with bump2version

This solution was derived from this article.

The use case - python GUI package distributed via PyInstaller. Needs to show version info.

Here is the structure of the project packagex

packagex
├── packagex
│   ├── __init__.py
│   ├── main.py
│   └── _version.py
├── packagex.spec
├── LICENSE
├── README.md
├── .bumpversion.cfg
├── requirements.txt
├── setup.cfg
└── setup.py

where setup.py is

# setup.py
import os

import setuptools

about = {}
with open("packagex/_version.py") as f:
    exec(f.read(), about)

os.environ["PBR_VERSION"] = about["__version__"]

setuptools.setup(
    setup_requires=["pbr"],
    pbr=True,
    version=about["__version__"],
)

packagex/_version.py contains just

__version__ = "0.0.1"

and packagex/__init__.py

from ._version import __version__

and for .bumpversion.cfg

[bumpversion]
current_version = 0.0.1
commit = False
tag = False
message = Bump version to v{new_version}
tag_message = v{new_version}


[bumpversion:file:packagex/_version.py]

And here is a GitHub project with this setup.

Upvotes: 5

Zakariya

Reputation: 777

Add __version__="0.0.1" to your main __init__.py:

import .submodule

__version__ = '0.0.1'

If your library is called mylib, this is the single source of truth for your version number which you can directly access by mylib.__version__. But you still need to add it to your setup.py file.

In your setup.py, you need to read the __init__.py as a text file:

import re
from setuptools import setup, find_packages

with open("mylib/__init__.py") as f:
    version= re.findall("__version__.*(\d.\d.\d).*", f.read())[0]

setup(
        name="mylib",
        version=version,
        packages=find_packages()
    )

There are different ways to read the __version__ variable from __init__.py as a text file. Check this one as an example: Single-sourcing the package version

Please keep in mind that you need the avoid the following points:

Do not import __version__ from __init__.py because this loads all sub-modules with their dependencies that are not available at the setup time and will fail.
Do not store __version__ in a separate file (e.g. version.py) if you are going to import it from your main directory (i.e. where your __init__.py is located) because it will automatically trigger __init__.py which will lead to the same issue mentioned in point 1.

Upvotes: 1

Arigion

Reputation: 3548

Seeing so many answers is a clean sign that there is no standard way.

So here's another: Poetry and importlib

I use the poetry-dynamic-versioning plugin to set the version on poetry build.

Then in the __init__.py of my package I have:

from importlib.metadata import version

__version__ = version(__name__)

Of course this requires to have a proper package structure and build process.

Upvotes: 5

smarie

Reputation: 5156

If your project uses git or mercurial as its SCM, I would recommend the following:

Configure your __init__.py as shown below so that it always sets the __version__ attribute correctly - both in development mode, non-pip development mode (python path updated by IDE), or production mode (pip install)

try:
    # -- Distribution mode --
    # import from _version.py generated by setuptools_scm during release
    from ._version import version as __version__
except ImportError:
    # -- Source mode --
    # use setuptools_scm to get the current version from src using git
    from setuptools_scm import get_version as _gv
    from os import path as _path
    __version__ = _gv(_path.join(_path.dirname(__file__), _path.pardir))

then, choose a way to generate the _version.py file that is required in production (the one imported on line 4 above).

a. I personally do this in setup.py:
```
setup(
  ...
  use_scm_version={'write_to': '%s/_version.py' % <pkgname>}
)
```
b. Alternately if you prefer to configure your project using a pyproject.toml or setup.cfg file, you can check the documentation in setuptools_scm to find how this is done. For example with pyproject.toml it is like this:
```
[tool.setuptools_scm]
write_to = "<pkgname>/_version.py"
```
c. Finally, an alternative is to execute a script manually when you wish to create releases. This script must run after git-tagging your project and before publishing it.
```
from setuptools_scm import get_version
get_version('.', write_to='<pkg_name>/_version.py')
```
you can for example run this as a single commandline in your continuous integration process:
```
> python -c "from setuptools_scm import get_version;get_version('.', write_to='<pkg_name>/_version.py')"
```

This pattern (1+2a) has worked successfully for me for dozens of published packages over the past years (for example makefun), so I can warmly recommend it.

Note: I originally provided the above tip in a separate web page here.

EDIT: setuptools_scm's documentation states that write_to is now deprecated (but still supported at the time of writing). They recommend to use version_file instead.

Upvotes: -1

wim

Reputation: 362796

No, there isn't a standard way to embed the version string in a Python package so that it's accessible as an attribute. A standard was proposed in PEP 396 – Module Version Numbers, but that PEP has been rejected in 2021.

What has been standardized:

The format of a version string (see PEP 440 – Version Identification and Dependency Specification)
How to store a version field in package metadata (see Core metadata specifications and PEP 566 – Metadata for Python Software Packages)
How to specify a version string in pyproject.toml (see Declaring project metadata and PEP 621 – Storing project metadata in pyproject.toml)

A couple of examples of non-standard approaches are a VERSION tuple:

>>> import django
>>> django.VERSION
(4, 2, 4, 'final', 0)

or a __version__ string:

>>> import requests
>>> requests.__version__
'2.31.0'

Increasingly, you'll find that many projects don't store a version attribute at all. Regardless of whether a project keeps a version attribute burnt into the source code, the recommended way to retrieve a package version reliably is by using stdlib importlib.metadata:

>>> from importlib.metadata import version
>>> version("django")
'4.2.4'
>>> version("requests")
'2.31.0'

If you've historically provided a version attribute for your package, and you wish to remove it but need to allow a deprecation period for backwards-compatibility reasons, you may use a module level __getattr__ fallback:

# myproj/__init__.py
import warnings
from importlib.metadata import version

def __getattr__(name: str): 
    if name == "__version__":
        warnings.warn(
            f"Accessing myproj.__version__ is deprecated and will be "
            "removed in a future release. Use importlib.metadata directly.",
            DeprecationWarning,
            stacklevel=2,
        )
        return version("myproj")
    raise AttributeError(f"module {__name__} has no attribute {name}")

This is the approach used by python-attrs 23.1.0 for example.

$ PYTHONWARNINGS=always python3 -c 'from attrs import __version__'
<string>:1: DeprecationWarning: Accessing attrs.__version__ is deprecated and will be removed in a future release. Use importlib.metadata directly to query for attrs's packaging metadata.

Don't bother using the module __getattr__ approach unless you're deprecating an existing version attribute from an old project. For new projects, my recommendation is not to provide a version attribute in the source code in the first place, so that the single source of truth for the version string is in the package metadata.

Upvotes: 4

happymacaron

Reputation: 490

Using setuptools and pyproject.toml

Setuptools now offers a way to dynamically get version in pyproject.toml

Reproducing the example here, you can create something like the following in your pyproject.toml

# ...
[project]
name = "my_package"
dynamic = ["version"]
# ...
[tool.setuptools.dynamic]
version = {attr = "my_package.__version__"}

Upvotes: 5

JAB

Reputation: 21089

There is a slightly simpler alternative to some of the other answers:

__version_info__ = ('1', '2', '3')
__version__ = '.'.join(__version_info__)

(And it would be fairly simple to convert auto-incrementing portions of version numbers to a string using str().)

Of course, from what I've seen, people tend to use something like the previously-mentioned version when using __version_info__, and as such store it as a tuple of ints; however, I don't quite see the point in doing so, as I doubt there are situations where you would perform mathematical operations such as addition and subtraction on portions of version numbers for any purpose besides curiosity or auto-incrementation (and even then, int() and str() can be used fairly easily). (On the other hand, there is the possibility of someone else's code expecting a numerical tuple rather than a string tuple and thus failing.)

This is, of course, my own view, and I would gladly like others' input on using a numerical tuple.

As shezi reminded me, (lexical) comparisons of number strings do not necessarily have the same result as direct numerical comparisons; leading zeroes would be required to provide for that. So in the end, storing __version_info__ (or whatever it would be called) as a tuple of integer values would allow for more efficient version comparisons.

Upvotes: 31

oefe

Reputation: 19916

Not directly an answer to your question, but you should consider naming it __version__, not version.

This is almost a quasi-standard. Many modules in the standard library use __version__, and this is also used in lots of 3rd-party modules, so it's the quasi-standard.

Usually, __version__ is a string, but sometimes it's also a float or tuple.

As mentioned by S.Lott (Thank you!), PEP 8 says it explicitly:

Module Level Dunder Names

Module level "dunders" (i.e. names with two leading and two trailing underscores) such as __all__, __author__, __version__, etc. should be placed after the module docstring but before any import statements except from __future__ imports.

You should also make sure that the version number conforms to the format described in PEP 440 (PEP 386 a previous version of this standard).

Upvotes: 209

Yan QiDong

Reputation: 4431

I prefer to read the package version from installation environment. This is my src/foo/_version.py:

from pkg_resources import get_distribution                                        
                                                                                  
__version__ = get_distribution('foo').version

Makesure foo is always already installed, that's why a src/ layer is required to prevent foo imported without installation.

In the setup.py, I use setuptools-scm to generate the version automatically.

Update in 2022.7.5:

There is another way, which is my faviourate now. Use setuptools-scm to generate a _version.py file.

setup(
    ...
    use_scm_version={
        'write_to':
        'src/foo/_version.py',
        'write_to_template':
        '"""Generated version file."""\n'
        '__version__ = "{version}"\n',
    },
)

Upvotes: 1

Oddthinking

Reputation: 25302

Per the deferred [STOP PRESS: rejected] PEP 396 (Module Version Numbers), there is a proposed way to do this. It describes, with rationale, an (admittedly optional) standard for modules to follow. Here's a snippet:

When a module (or package) includes a version number, the version SHOULD be available in the __version__ attribute.

For modules which live inside a namespace package, the module SHOULD include the __version__ attribute. The namespace package itself SHOULD NOT include its own __version__ attribute.

The __version__ attribute's value SHOULD be a string.

Upvotes: 33

sorin

Reputation: 170508

Rewritten 2017-05

After 13+ years of writing Python code and managing various packages, I came to the conclusion that DIY is maybe not the best approach.

I started using the pbr package for dealing with versioning in my packages. If you are using git as your SCM, this will fit into your workflow like magic, saving your weeks of work (you will be surprised about how complex the issue can be).

As of today, pbr has 12M mongthly downloads, and reaching this level didn't include any dirty tricks. It was only one thing -- fixing a common packaging problem in a very simple way.

pbr can do more of the package maintenance burden, and is not limited to versioning, but it does not force you to adopt all its benefits.

So to give you an idea about how it looks to adopt pbr in one commit have a look switching packaging to pbr

Probably you would observed that the version is not stored at all in the repository. PBR does detect it from Git branches and tags.

No need to worry about what happens when you do not have a git repository because pbr does "compile" and cache the version when you package or install the applications, so there is no runtime dependency on git.

Old solution

Here is the best solution I've seen so far and it also explains why:

Inside yourpackage/version.py:

# Store the version here so:
# 1) we don't load dependencies by storing it in __init__.py
# 2) we can import it in setup.py for the same reason
# 3) we can import it into your module module
__version__ = '0.12'

Inside yourpackage/__init__.py:

from .version import __version__

Inside setup.py:

exec(open('yourpackage/version.py').read())
setup(
    ...
    version=__version__,
    ...

If you know another approach that seems to be better let me know.

Upvotes: 144

LightCC

Reputation: 11659

Using `setuptools` and `pbr`

There is not a standard way to manage version, but the standard way to manage your packages is setuptools.

The best solution I've found overall for managing version is to use setuptools with the pbr extension. This is now my standard way of managing version.

Setting up your project for full packaging may be overkill for simple projects, but if you need to manage version, you are probably at the right level to just set everything up. Doing so also makes your package releasable at PyPi so everyone can download and use it with Pip.

PBR moves most metadata out of the setup.py tools and into a setup.cfg file that is then used as a source for most metadata, which can include version. This allows the metadata to be packaged into an executable using something like pyinstaller if needed (if so, you will probably need this info), and separates the metadata from the other package management/setup scripts. You can directly update the version string in setup.cfg manually, and it will be pulled into the *.egg-info folder when building your package releases. Your scripts can then access the version from the metadata using various methods (these processes are outlined in sections below).

When using Git for VCS/SCM, this setup is even better, as it will pull in a lot of the metadata from Git so that your repo can be your primary source of truth for some of the metadata, including version, authors, changelogs, etc. For version specifically, it will create a version string for the current commit based on git tags in the repo.

PyPA - Packaging Python Packages with SetupTools - Tutorial
PBR latest build usage documentation - How to setup an 8-line setup.py and a setup.cfg file with the metadata.

As PBR will pull version, author, changelog and other info directly from your git repo, so some of the metadata in setup.cfg can be left out and auto generated whenever a distribution is created for your package (using setup.py)

Get the current version in real-time

setuptools will pull the latest info in real-time using setup.py:

python setup.py --version

This will pull the latest version either from the setup.cfg file, or from the git repo, based on the latest commit that was made and tags that exist in the repo. This command doesn't update the version in a distribution though.

Updating the version metadata

When you create a distribution with setup.py (i.e. py setup.py sdist, for example), then all the current info will be extracted and stored in the distribution. This essentially runs the setup.py --version command and then stores that version info into the package.egg-info folder in a set of files that store distribution metadata.

Note on process to update version meta-data:

If you are not using pbr to pull version data from git, then just update your setup.cfg directly with new version info (easy enough, but make sure this is a standard part of your release process).

If you are using git, and you don't need to create a source or binary distribution (using python setup.py sdist or one of the python setup.py bdist_xxx commands) the simplest way to update the git repo info into your <mypackage>.egg-info metadata folder is to just run the python setup.py install command. This will run all the PBR functions related to pulling metadata from the git repo and update your local .egg-info folder, install script executables for any entry-points you have defined, and other functions you can see from the output when you run this command.

Note that the .egg-info folder is generally excluded from being stored in the git repo itself in standard Python .gitignore files (such as from Gitignore.IO), as it can be generated from your source. If it is excluded, make sure you have a standard "release process" to get the metadata updated locally before release, and any package you upload to PyPi.org or otherwise distribute must include this data to have the correct version. If you want the Git repo to contain this info, you can exclude specific files from being ignored (i.e. add !*.egg-info/PKG_INFO to .gitignore)

Accessing the version from a script

You can access the metadata from the current build within Python scripts in the package itself. For version, for example, there are several ways to do this I have found so far:

## This one is a new built-in as of Python 3.8.0 should become the standard
from importlib.metadata import version

v0 = version("mypackage")
print('v0 {}'.format(v0))

## I don't like this one because the version method is hidden
import pkg_resources  # part of setuptools

v1 = pkg_resources.require("mypackage")[0].version
print('v1 {}'.format(v1))

# Probably best for pre v3.8.0 - the output without .version is just a longer string with
# both the package name, a space, and the version string
import pkg_resources  # part of setuptools

v2 = pkg_resources.get_distribution('mypackage').version
print('v2 {}'.format(v2))

## This one seems to be slower, and with pyinstaller makes the exe a lot bigger
from pbr.version import VersionInfo

v3 = VersionInfo('mypackage').release_string()
print('v3 {}'.format(v3))

You can put one of these directly in your __init__.py for the package to extract the version info as follows, similar to some other answers:

__all__ = (
    '__version__',
    'my_package_name'
)

import pkg_resources  # part of setuptools

__version__ = pkg_resources.get_distribution("mypackage").version

Upvotes: 5

Belter

Reputation: 3807

Create a file named by _version.txt in the same folder as __init__.py and write version as a single line:

0.8.2

Read this infomation from file _version.txt in __init__.py:

    import os 
    def get_version():
        with open(os.path.join(os.path.abspath(os.path.dirname(__file__)), "_version.txt")) as f:
            return f.read().strip() 
    __version__ = get_version()

Upvotes: 0

Marc Maxmeister

Reputation: 4689

After several hours of trying to find the simplest reliable solution, here are the parts:

create a version.py file INSIDE the folder of your package "/mypackage":

# Store the version here so:
# 1) we don't load dependencies by storing it in __init__.py
# 2) we can import it in setup.py for the same reason
# 3) we can import it into your module module
__version__ = '1.2.7'

in setup.py:

exec(open('mypackage/version.py').read())
setup(
    name='mypackage',
    version=__version__,

in the main folder init.py:

from .version import __version__

The exec() function runs the script outside of any imports, since setup.py is run before the module can be imported. You still only need to manage the version number in one file in one place, but unfortunately it is not in setup.py. (that's the downside, but having no import bugs is the upside)

Upvotes: 4

Anto

Reputation: 7222

arrow handles it in an interesting way.

Now (since 2e5031b)

In arrow/__init__.py:

__version__ = 'x.y.z'

In setup.py:

from arrow import __version__

setup(
    name='arrow',
    version=__version__,
    # [...]
)

Before

In arrow/__init__.py:

__version__ = 'x.y.z'
VERSION = __version__

In setup.py:

def grep(attrname):
    pattern = r"{0}\W*=\W*'([^']+)'".format(attrname)
    strval, = re.findall(pattern, file_text)
    return strval

file_text = read(fpath('arrow/__init__.py'))

setup(
    name='arrow',
    version=grep('__version__'),
    # [...]
)

Upvotes: 6

Zooko

Reputation: 2412

I use a single _version.py file as the "once cannonical place" to store version information:

It provides a __version__ attribute.
It provides the standard metadata version. Therefore it will be detected by pkg_resources or other tools that parse the package metadata (EGG-INFO and/or PKG-INFO, PEP 0345).
It doesn't import your package (or anything else) when building your package, which can cause problems in some situations. (See the comments below about what problems this can cause.)
There is only one place that the version number is written down, so there is only one place to change it when the version number changes, and there is less chance of inconsistent versions.

Here is how it works: the "one canonical place" to store the version number is a .py file, named "_version.py" which is in your Python package, for example in myniftyapp/_version.py. This file is a Python module, but your setup.py doesn't import it! (That would defeat feature 3.) Instead your setup.py knows that the contents of this file is very simple, something like:

__version__ = "3.6.5"

And so your setup.py opens the file and parses it, with code like:

import re
VERSIONFILE="myniftyapp/_version.py"
verstrline = open(VERSIONFILE, "rt").read()
VSRE = r"^__version__ = ['\"]([^'\"]*)['\"]"
mo = re.search(VSRE, verstrline, re.M)
if mo:
    verstr = mo.group(1)
else:
    raise RuntimeError("Unable to find version string in %s." % (VERSIONFILE,))

Then your setup.py passes that string as the value of the "version" argument to setup(), thus satisfying feature 2.

To satisfy feature 1, you can have your package (at run-time, not at setup time!) import the _version file from myniftyapp/__init__.py like this:

from _version import __version__

Here is an example of this technique that I've been using for years.

The code in that example is a bit more complicated, but the simplified example that I wrote into this comment should be a complete implementation.

Here is example code of importing the version.

If you see anything wrong with this approach, please let me know.

Upvotes: 175

Oran

Reputation: 877

Use a version.py file only with __version__ = <VERSION> param in the file. In the setup.py file import the __version__ param and put it's value in the setup.py file like this: version=__version__
Another way is to use just a setup.py file with version=<CURRENT_VERSION> - the CURRENT_VERSION is hardcoded.

Since we don't want to manually change the version in the file every time we create a new tag (ready to release a new package version), we can use the following..

I highly recommend bumpversion package. I've been using it for years to bump a version.

start by adding version=<VERSION> to your setup.py file if you don't have it already.

You should use a short script like this every time you bump a version:

bumpversion (patch|minor|major) - choose only one option
git push
git push --tags

Then add one file per repo called: .bumpversion.cfg:

[bumpversion]
current_version = <CURRENT_TAG>
commit = True
tag = True
tag_name = {new_version}
[bumpversion:file:<RELATIVE_PATH_TO_SETUP_FILE>]

Note:

You can use __version__ parameter under version.py file like it was suggested in other posts and update the bumpversion file like this: [bumpversion:file:<RELATIVE_PATH_TO_VERSION_FILE>]
You must git commit or git reset everything in your repo, otherwise you'll get a dirty repo error.
Make sure that your virtual environment includes the package of bumpversion, without it it will not work.

Upvotes: -1

cmcginty

Reputation: 117028

Many of these solutions here ignore git version tags which still means you have to track version in multiple places (bad). I approached this with the following goals:

Derive all python version references from a tag in the git repo
Automate git tag/push and setup.py upload steps with a single command that takes no inputs.

How it works:

From a make release command, the last tagged version in the git repo is found and incremented. The tag is pushed back to origin.
The Makefile stores the version in src/_version.py where it will be read by setup.py and also included in the release. Do not check _version.py into source control!
setup.py command reads the new version string from package.__version__.

Details:

Makefile

# remove optional 'v' and trailing hash "v1.0-N-HASH" -> "v1.0-N"
git_describe_ver = $(shell git describe --tags | sed -E -e 's/^v//' -e 's/(.*)-.*/\1/')
git_tag_ver      = $(shell git describe --abbrev=0)
next_patch_ver = $(shell python versionbump.py --patch $(call git_tag_ver))
next_minor_ver = $(shell python versionbump.py --minor $(call git_tag_ver))
next_major_ver = $(shell python versionbump.py --major $(call git_tag_ver))

.PHONY: ${MODULE}/_version.py
${MODULE}/_version.py:
    echo '__version__ = "$(call git_describe_ver)"' > $@

.PHONY: release
release: test lint mypy
    git tag -a $(call next_patch_ver)
    $(MAKE) ${MODULE}/_version.py
    python setup.py check sdist upload # (legacy "upload" method)
    # twine upload dist/*  (preferred method)
    git push origin master --tags

The release target always increments the 3rd version digit, but you can use the next_minor_ver or next_major_ver to increment the other digits. The commands rely on the versionbump.py script that is checked into the root of the repo

versionbump.py

"""An auto-increment tool for version strings."""

import sys
import unittest

import click
from click.testing import CliRunner  # type: ignore

__version__ = '0.1'

MIN_DIGITS = 2
MAX_DIGITS = 3


@click.command()
@click.argument('version')
@click.option('--major', 'bump_idx', flag_value=0, help='Increment major number.')
@click.option('--minor', 'bump_idx', flag_value=1, help='Increment minor number.')
@click.option('--patch', 'bump_idx', flag_value=2, default=True, help='Increment patch number.')
def cli(version: str, bump_idx: int) -> None:
    """Bumps a MAJOR.MINOR.PATCH version string at the specified index location or 'patch' digit. An
    optional 'v' prefix is allowed and will be included in the output if found."""
    prefix = version[0] if version[0].isalpha() else ''
    digits = version.lower().lstrip('v').split('.')

    if len(digits) > MAX_DIGITS:
        click.secho('ERROR: Too many digits', fg='red', err=True)
        sys.exit(1)

    digits = (digits + ['0'] * MAX_DIGITS)[:MAX_DIGITS]  # Extend total digits to max.
    digits[bump_idx] = str(int(digits[bump_idx]) + 1)  # Increment the desired digit.

    # Zero rightmost digits after bump position.
    for i in range(bump_idx + 1, MAX_DIGITS):
        digits[i] = '0'
    digits = digits[:max(MIN_DIGITS, bump_idx + 1)]  # Trim rightmost digits.
    click.echo(prefix + '.'.join(digits), nl=False)


if __name__ == '__main__':
    cli()  # pylint: disable=no-value-for-parameter

This does the heavy lifting how to process and increment the version number from git.

init.py

The my_module/_version.py file is imported into my_module/__init__.py. Put any static install config here that you want distributed with your module.

from ._version import __version__
__author__ = ''
__email__ = ''

setup.py

The last step is to read the version info from the my_module module.

from setuptools import setup, find_packages

pkg_vars  = {}

with open("{MODULE}/_version.py") as fp:
    exec(fp.read(), pkg_vars)

setup(
    version=pkg_vars['__version__'],
    ...
    ...
)

Of course, for all of this to work you'll have to have at least one version tag in your repo to start.

git tag -a v0.0.1

Upvotes: 17

Martin Ibert

Reputation: 1

If you use CVS (or RCS) and want a quick solution, you can use:

__version__ = "$Revision: 1.1 $"[11:-2]
__version_info__ = tuple([int(s) for s in __version__.split(".")])

(Of course, the revision number will be substituted for you by CVS.)

This gives you a print-friendly version and a version info that you can use to check that the module you are importing has at least the expected version:

import my_module
assert my_module.__version_info__ >= (1, 1)

Upvotes: -3

Andy Lee

Reputation: 920

I use a JSON file in the package dir. This fits Zooko's requirements.

Inside pkg_dir/pkg_info.json:

{"version": "0.1.0"}

Inside setup.py:

from distutils.core import setup
import json

with open('pkg_dir/pkg_info.json') as fp:
    _info = json.load(fp)

setup(
    version=_info['version'],
    ...
    )

Inside pkg_dir/__init__.py:

import json
from os.path import dirname

with open(dirname(__file__) + '/pkg_info.json') as fp:
    _info = json.load(fp)

__version__ = _info['version']

I also put other information in pkg_info.json, like author. I like to use JSON because I can automate management of metadata.

Upvotes: 16

James Antill

Reputation: 2855

Also worth noting is that as well as __version__ being a semi-std. in python so is __version_info__ which is a tuple, in the simple cases you can just do something like:

__version__ = '1.2.3'
__version_info__ = tuple([ int(num) for num in __version__.split('.')])

...and you can get the __version__ string from a file, or whatever.

Upvotes: 7

L1ker

Reputation: 990

I also saw another style:

>>> django.VERSION
(1, 1, 0, 'final', 0)

Upvotes: 5

dF.

Reputation: 75785

There doesn't seem to be a standard way to embed a version string in a python package. Most packages I've seen use some variant of your solution, i.e. eitner

Embed the version in setup.py and have setup.py generate a module (e.g. version.py) containing only version info, that's imported by your package, or
The reverse: put the version info in your package itself, and import that to set the version in setup.py

Upvotes: 6

Matt

Reputation: 747

For what it's worth, if you're using NumPy distutils, numpy.distutils.misc_util.Configuration has a make_svn_version_py() method that embeds the revision number inside package.__svn_version__ in the variable version .

Upvotes: -4

Standard way to embed version into Python package?

Answers (25)

pbr with bump2version

Using setuptools and pyproject.toml

Module Level Dunder Names

Rewritten 2017-05

Old solution

Using setuptools and pbr

Get the current version in real-time

Updating the version metadata

Note on process to update version meta-data:

Accessing the version from a script

How it works:

Details:

Makefile

versionbump.py

__init__.py

setup.py

Related Questions

Using `setuptools` and `pbr`

init.py